Crossword Genius

Unfashionable affair, better (5)

Ross

I believe the answer is:

outdo

'better' is the definition.
(thesaurus)

'unfashionable affair' is the wordplay.
'unfashionable' becomes 'out' ('out' can be a synonym of 'unfashionable').
'affair' becomes 'do' (do is a kind of affair).
'out'+'do'='OUTDO'

(Other definitions for outdo that I've seen before include "Perform better than, be superior to" , "Perform better than (someone)" , "Eclipse" , "Get the better of" , "Defeat" .)

I've seen this clue in The Telegraph.
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