Vet relishes flexing arm (11)
I believe the answer is:
shirtsleeve
'arm' is the definition.
(arm can mean the arm of a sleeve)
'vet relishes flexing' is the wordplay.
'flexing' indicates an anagram (letters flex or warp around).
'vet'+'relishes'='vetrelishes'
'vetrelishes' anagrammed gives 'SHIRTSLEEVE'.
I've seen this clue in The Times.
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