Gave a gratuity (6)
I believe the answer is:
tipped
'gave a gratuity' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for tipped that I've seen before include "Crowned" , "Given a gratuity" , "Predicted to be a winner" , "Gave reward (to waiter)" , "Gave gratuity to or touched" .)