Secular bet (3)
I believe the answer is:
lay
I believe this is a double definition.
'secular' is the first definition.
(synonyms)
'bet' is the second definition.
(I've seen this in other clues)
(Other definitions for lay that I've seen before include "Set (table)" , "Not ordained into clergy" , "Non-professional - ballad" , "Place on a surface" , "Air" .)