Poker player's giveaway (4)
I believe the answer is:
tell
'poker player's giveaway' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tell that I've seen before include "work in a bank" , "his hitting the apple?" , "Count - give an account" , "Instruct" , "William ..., skilled Swiss archer" .)