Crown put away under pressure (4)
I believe the answer is:
pate
'crown' is the definition.
('pate' can be a synonym of 'crown')
'put away under pressure' is the wordplay.
'put away' becomes 'ate' (I've seen this in other clues**).
'under' is a charade indicator (letters next to each other).
'pressure' becomes 'p' (abbreviation).
'ate' after 'p' is 'PATE'.
(Other definitions for pate that I've seen before include "Meat paste or head" , "Top of one's head" , "Tape for a head" , "Crown of the head" , "Savoury spread" .)