They go round making money in wagers (5)
I believe the answer is:
belts
'they go round' is the definition.
The definition suggests an adverb but the answer is not.
'money in wagers' is the wordplay.
'money' becomes 'l' (L can mean 'pounds').
'in' indicates putting letters inside.
'wagers' becomes 'bets' ('bet' can be a synonym of 'wager').
'l' inserted inside 'bets' is 'BELTS'.
'making' is the link.
Can you help me to learn more?
(Other definitions for belts that I've seen before include "Moves quickly" , "Hits" , "Waist bands" , "Leather bands" , "Fat controllers perhaps" .)