Is she mostly preferred for being fair? (6)
I believe the answer is:
blonde
'being fair?' is the definition.
(similar in meaning)
'is she mostly preferred' is the wordplay.
I cannot really see how this works, but
'she' could be 'de' and 'de' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'for' acts as a link.
Can you help me to learn more?
(Other definitions for blonde that I've seen before include "Pale-haired" , "Of a woman, having fair hair (6)" , "Light-haired woman" , "Fair-haired person" , "Person with fair hair" .)