Put down, face to back (4)
I believe the answer is:
laid
'put down' is the definition.
(I've seen this before)
'face to back' is the wordplay.
'face' becomes 'dial' (dial is a kind of face).
'to back' is a reversal indicator.
'dial' back-to-front is 'LAID'.
(Other definitions for laid that I've seen before include "Wagered" , "Produced (an egg)" , "Doze" , "The clutch must be" , "(Of dining table) set" .)