Agent's gamble on game with small note (2-7)
I believe the answer is:
go-between
'agent's' is the definition.
(I've seen this before)
'gamble on game with small note' is the wordplay.
'gamble' becomes 'bet' (bet is a kind of gamble).
'on' means one lot of letters go next to another.
'game' becomes 'go' (go is a board game).
'with' says to put letters next to each other.
'small note' becomes 'ween' (I am not sure about this - if you are sure you should believe this answer much more).
'bet' put after 'go' is 'gobet'.
'gobet'+'ween'='GO-BETWEEN'
Can you help me to learn more?
(Other definitions for go-between that I've seen before include "Intermediary" , "One who acts as messenger or negotiator" , "Runner" .)