A cinch, right? Wrong! (5)

I believe the answer is:

girth

'a cinch' is the definition.
('girth' can be a synonym of 'cinch')

'right? wrong' is the wordplay.
'wrong' is an anagram indicator.
'right' with letters rearranged gives 'GIRTH'.

(Other definitions for girth that I've seen before include "Personal circumference" , "Body's circumference around the middle" , "Distance round the middle" , "Some tack" , "Band around a horse's belly" .)

I've seen this clue in The Telegraph.

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