Star pitcher (3)
I believe the answer is:
ace
'star pitcher' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ace that I've seen before include "Hole in one; very good" , "Top card or champion" , "reason for point of no return" , "One or 11 in cards" , "Person who excels, a top card" .)