The clue, which is for the Cryptic only as the Times 2 has a whole different set of clues and answers, is...
Betray twin on trial (6-5). Double = Twin and Trial = Cross, something to bear/putt up with.
Cross = Trial is in Bradford's crossword dictionary, so it's probably cropped up in quite a few crosswords. Chambers gives one definition of 'cross' as 'a burden, something that causes suffering'. One definition of 'trial' is 'suffering' - so I think the clue works out reasonably well.