* Barnaby Joyce re-elected, will return to parliament
* Election victory restores coalition government's majority
* PM Turnbull says rise in support vindicates coalition (Updates throughout with Joyce regaining seat)
By Jane Wardell
SYDNEY, Dec 2 (Reuters) - Australia's former deputy prime minister Barnaby Joyce cleared the way for his return to parliament on Saturday, winning a by-election just over a month after he was kicked out over a dual citizenship crisis that cost the government its majority.
Joyce was not only returned in his New England seat in New South Wales but was forecast to have lifted his primary vote by at least 10 points, giving Prime Minister Malcolm Turnbull a welcome boost after a tough few weeks.
"This has been a stunning victory," Turnbull told supporters as he joined Joyce at a pub in the town of Tamworth.
Exit polls were predicting "the largest swing to the government in the history of by-elections in Australia", Turnbull said, adding it was a vindication of his coalition. "We're getting the band back together."
Joyce was one of the "Citizenship Seven" whose eligibility to sit in parliament was thrown into doubt when it was found they were dual citizens, a status that is barred for politicians under Australia's constitution to prevent split allegiances.
The High Court ruled on Oct. 27 that Joyce, along with four of the seven other lawmakers, was ineligible to remain in parliament, forcing a by-election. Joyce was found to be a dual citizen of New Zealand, a status he has since rescinded.
The deputy leader position, traditionally held by a member of the junior coalition partner, the National Party, had remained vacant since the High Court ruling.
The result comes at a difficult time for Turnbull, who earlier this week reversed his long-held opposition to a full-blown inquiry into the country's scandal-hit financial sector amid mounting political pressure.
Turnbull has also seen a splinter within his centre right Liberal-National coalition over same-sex marriage, with the conservative faction, led by some of the Nationals, angered by his promise to push through legislation after an historic public vote in favour of the unions.
The last day of campaigning for the by-election was marred by a call from New South Wales Nationals state leader and deputy premier John Barilaro for Turnbull to step down as a "Christmas gift" to the nation.
The comments were quickly rebuffed by Liberal Party lawmakers and Joyce, who said they were "very unhelpful" and "insulting."