Replayed tennis point (3)
I believe the answer is:
let
'replayed tennis point' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for let that I've seen before include "Allow or lease" , "& 15 Triple (anag.)" , "Allow, don't hinder" , "Allow on the tennis court" , "Permit or rent" .)