Hide split in storm (10)
I believe the answer is:
cloudburst
'storm' is the definition.
(sudden rainstorm)
'hide split' is the wordplay.
'hide' becomes 'cloud' (clouding is a kind of hiding).
'split' becomes 'burst' (synonyms).
'cloud'+'burst'='CLOUDBURST'
'in' is the link.
(Other definitions for cloudburst that I've seen before include "storm" , "Sudden rainstorm" , "Sudden, heavy downpour" , "dramatic downfall" , "sudden shower" .)