Attractive blonde (4)
I believe the answer is:
fair
I believe this clue is a double definition.
'attractive' is the first definition.
('fair' can be a synonym of 'attractive')
'blonde' is the second definition.
('fair' can be similar in meaning to 'blonde')
(Other definitions for fair that I've seen before include "light headed" , "Impartial, so-so" , "Light; entertainment" , "not cloudy" , "Reasonable; pretty" .)