Stop taking the hat round for money (4)
I believe the answer is:
halt
'stop' is the definition.
(halt can mean to stop)
'the hat round for money' is the wordplay.
'round' is an insertion indicator.
'for money' becomes 'l' (I can't justify this - if you can you should believe this answer much more).
'hat' enclosing 'l' is 'HALT'.
'taking' acts as a link.
Can you help me to learn more?
(Other definitions for halt that I've seen before include "Pull up" , "Cease" , "Stop or pause" , "Stop; minor station" , "Falter - stop" .)