Are accessories to answer wager? (4)
I believe the answer is:
abet
'are accessories to' is the definition.
'answer wager?' is the wordplay.
'answer' becomes 'a' (abbreviation eg in Q and A).
'wager?' becomes 'bet' ('bet' can be a synonym of 'wager').
'a'+'bet'='ABET'
(Other definitions for abet that I've seen before include "Support, aid" , "Assist criminally" , "Aid (a criminal)" , "Assist (in wrongdoing)" , "Assist illegally" .)