One mist might be wet (7)
I believe the answer is:
moisten
'wet' is the definition.
(I know that moisten is a type of wet)
'one mist might be' is the wordplay.
'might be' is an anagram indicator.
'one'+'mist'='onemist'
'onemist' is an anagram of 'MOISTEN'.
(Other definitions for moisten that I've seen before include "Add water - dampen" , "Make damp, say lips with tongue" , "What one's eyes may do!" , "It's on me (anag)" , "Make damp or slightly wet" .)