Gregory’s kiss? (4)
I believe the answer is:
peck
This clue is a double definition.
'gregory's' is the first definition.
(I've seen this before)
'kiss?' is the second definition.
(pecking is a kind of kissing)
(Other definitions for peck that I've seen before include "Light kiss; measure" , "lot of pints" , "Strike with beak" , "Kiss; part of bushel" , "Nibble" .)