Alec fashionable with gene for style (8)
I believe the answer is:
elegance
'for style' is the definition.
(I've seen this in another clue)
'alec fashionable with gene' is the wordplay.
'fashionable with' indicates anagramming the letters (letters can be fashioned into something else).
'alec' anagrammed with 'gene' can make 'ELEGANCE'.
(Other definitions for elegance that I've seen before include "Showing good taste in dress or style" , "Graceful refinement" , "Fine quality" , "Refinement, polish" , "Polish - distinction" .)