Bishop loves scary shout (3)
I believe the answer is:
boo
'scary shout' is the definition.
(I've seen this in another clue)
'bishop loves' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'loves' becomes 'oo' (love means 0 in tennis).
'b'+'oo'='BOO'
(Other definitions for boo that I've seen before include "Shout in disgust" , "A shocking exclamation!" , "Disapproving sound" , "Expression of disapproval" , "I hated that!" .)