Has a cry of pain, and nauseous, extremely (4)
I believe the answer is:
owns
'has' is the definition.
('own' can be a synonym of 'have')
'a cry of pain and nauseous extremely' is the wordplay.
'a cry of pain' becomes 'ow' (I've seen this in other clues).
'and' is a charade indicator (letters next to each other).
'extremely' means to remove the middle letters.
'nauseous' with its centre taken out is 'ns'.
'ow'+'ns'='OWNS'
(Other definitions for owns that I've seen before include "Admits possession" , "Belongs to" , "Has possession of by right" , "Confesses" , "uses" .)