Drink only partially satisfies a king (4)
I believe the answer is:
saki
'drink' is the definition.
(saki is a kind of drink)
'only partially satisfies a king' is the wordplay.
'only partially' says the answer is hidden in the clue.
'SAKI' is hidden within 'satisfies a king'.
(Other definitions for saki that I've seen before include "Japanese rice wine" , "Short-story writer" , "Pen name of short story writer, H.H. Munro, d. 1916" , "Pen-name of Hector Hugh Munro, d. 1916" , "Author H. H. Munro's pseudonym" .)