Reassuring touch (3)

I believe the answer is:
pat
'reassuring touch' 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 "Conveniently; light touch" , "Touch gently; glib" , "Touch lightly - bit of butter?" , "Light hand stroke" , "Knob (of butter)" .)