Want chess player to sacrifice bishop (4)
I believe the answer is:
lack
'want' is the definition.
(I know that want can be written as lack)
'chess player to sacrifice bishop' is the wordplay.
'chess player' becomes 'black' (one of the two players in a game of chess).
'to sacrifice' suggests deleting specific letters (some letters sacrificed).
'bishop' becomes 'B' (abbreviation for bishop in chess).
'black' with 'b' removed is 'LACK'.
(Other definitions for lack that I've seen before include "Be wanting or without" , "Absence, deficiency" , "Shortage" , "Deficiency (of something)" , "Be without, need" .)