Brusque king tucking into chop (4)
I believe the answer is:
curt
'brusque' is the definition.
(synonyms)
'king tucking into chop' is the wordplay.
'king' becomes 'R' (abbreviation for rex, king in Latin).
'tucking into' indicates putting letters inside.
'chop' becomes 'cut' (cut can mean to chop up).
'r' inserted into 'cut' is 'CURT'.
(Other definitions for curt that I've seen before include "Concise" , "Unceremonious" , "Brief and terse" , "Snappy" , "Rude" .)