Placed, as a bet (4)
I believe the answer is:
laid
'placed as a bet' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for laid that I've seen before include "The clutch must be" , "(Of dining table) set" , "Put down like dial" , "Placed horizontally on a surface" , "Flattened by wind and rain" .)