Player's sweetheart, slangily (3)

I believe the answer is:

wag

(Other definitions for wag that I've seen before include "Move from side to side like dog's tail" , "Vibrate; jester" , "The wit to move the tail" , "Move briskly to and fro" , "Joker; move tail" .)

I've seen this clue in The Guardian.

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