Moons no different in rainy season (7)
I believe the answer is:
monsoon
'rainy season' is the definition.
(monsoon is a kind of rainy season)
'moons no different' is the wordplay.
'different' is an anagram indicator.
'moons'+'no'='moonsno'
'moonsno' is an anagram of 'MONSOON'.
'in' is the link.
(Other definitions for monsoon that I've seen before include "Rain-bringing wind" , "Rainy season in southern Asia" , "Rainy season of India and SE Asia" , "Seasonal Indian Ocean wind" , "Wild weather" .)