Wet person missing an identity (5)
I believe the answer is:
humid
'wet person' is the definition.
'humid' can be an answer for 'wet' (thesaurus). I'm unsure of the 'person' bit.
'missing an identity' is the wordplay.
'missing an' becomes 'hum' (I can't explain this - if you can you should believe this answer much more).
'identity' becomes 'id' (I've seen this in other clues).
'hum'+'id'='HUMID'
Can you help me to learn more?
(Other definitions for humid that I've seen before include "Close" , "Sultry" , "Warm and steamy" , "'Moist, damp (5)'" , "Clammy" .)