What’s in wet areas, affected by storms? (8)
I believe the answer is:
seawater
'what's in' is the definition.
I can't judge whether this defines the answer.
'wet areas affected by storms?' is the wordplay.
'affected by storms?' is an anagram indicator (the order of letters in a stormy condition).
'wet'+'areas'='wetareas'
'wetareas' is an anagram of 'SEAWATER'.
(Other definitions for seawater that I've seen before include "Drink" , "Brine" , "What breaches dyke, perhaps" .)