Fair, when daughter punches devious noble (6)
I believe the answer is:
blonde
'fair' is the definition.
(similar in meaning)
'daughter punches devious noble' is the wordplay.
'daughter' becomes 'd' (genealogical abbreviation).
'punches' indicates putting letters inside (punch can mean to create a hole in).
'devious' indicates an anagram.
'noble' anagrammed gives 'blone'.
'd' put within 'blone' is 'BLONDE'.
'when' acts as a link.
(Other definitions for blonde that I've seen before include "Pale-haired" , "Fair-headed" , "Light-haired woman" , "Flaxen" , "Of a woman, having fair hair (6)" .)