Sunny market (4)
I believe the answer is:
fair
I believe this clue is a double definition.
'sunny' is the first definition.
('fair' can be similar in meaning to 'sunny')
'market' is the second definition.
(I've seen this before)
(Other definitions for fair that I've seen before include "'Just, meet (4)'" , "Reasonable - market" , "Pretty good" , "light headed" , "Moderate" .)