Wet season (7)
I believe the answer is:
monsoon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wet season</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)