Crackerjack
'crackerjack' 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 "fighter pilot" , "SERVE?] that's non-returnable" , "even higher than the king" , "Possibly a diamond" , "One-spotted card" .)
'crackerjack' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pro that I've seen before include "Competent person" , "With qualifications" , "Favouring the professional" , "Skilled" , "In short, not an amateur" .)