Score point after key cue broke (5)
I believe the answer is:
deuce
'score' is the definition.
(I've seen this before)
'point after key cue broke' is the wordplay.
'point' becomes 'e' (compass point).
'after' says to put letters next to each other.
'key' becomes 'd' (musical key).
'broke' is an anagram indicator.
'cue' anagrammed gives 'uce'.
'e' put after 'd' is 'de'.
'de'+'uce'='DEUCE'
(Other definitions for deuce that I've seen before include "situation of no advantage to either side" , "score, forty apiece" , "with equal score" , "Forty all in tennis" , "Dickens" .)