Disreputable (but attractive) British fliers and swimmers (7)
I believe the answer is:
raffish
'disreputable but attractive' is the definition.
(I've seen this before)
'british fliers and swimmers' is the wordplay.
'british fliers' becomes 'RAF' (Royal Air Force).
'and' is a charade indicator (letters next to each other).
'swimmers' becomes 'fish'.
'raf'+'fish'='RAFFISH'
(Other definitions for raffish that I've seen before include "unconventional" , "Dissolute" , "Rakish" , "like British airmen?" , "Tawdry" .)