Wet season (7)
I believe the answer is:
monsoon
'wet season' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for monsoon that I've seen before include "Rainy season in southern Asia" , "Seasonal wind (south-west or north-east) of southern Asia" , "Seasonal Asian wind" , "A lot of rain, perhaps" , "Seasonal wind and rain in S Asia" .)