Pacifier for fool (5)
I believe the answer is:
dummy
This clue is a double definition.
'pacifier' is the first definition.
(I've seen this before)
'fool' is the second definition.
(I've seen this before)
'for' acts as a link.
(Other definitions for dummy that I've seen before include "Fool" , "Model of a human being" , "Mock-up; non-working version" , "Mannequin" , "Visible hand of cards" .)