rainy season (7)
I believe the answer is:
monsoon
'rainy season' is the definition.
(monsoon is a kind of rainy season)
This is all the clue.
(Other definitions for monsoon that I've seen before include "Season of heavy rain" , "Asian wind; rainy season" , "Seasonal Asian wind" , "'Seasonal wind in southern Asia, brings heavy rains (7)'" , "Wet seasonal wind" .)