Drove ball, umpire's call abruptly being reversed (4)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

DEUC <e> (=umpire’s call, in tennis); “abruptly” means last letter is dropped; “being reversed” indicates reversal; to cue is to hit (“drive”) the ball, in snooker, billiards, etc