Cheat, with "out" (3)
I believe the answer is:
ace
'cheat with out' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ace that I've seen before include "Card with a single pip" , "fighter pilot" , "Playing card with a single symbol" , "Adept" , "Tennis serve that the receiver is unable to reach" .)