Bit of butter (3)
I believe the answer is:
pat
'bit of butter' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pat that I've seen before include "Some butter, maybe" , "Conveniently; light touch" , "Touch; name" , "Slick; dab" , "Gentle stroke of the hand with fluent repetition" .)