One might push the boat out and bet stake (4,4)
I believe the answer is:
punt pole
'one might push the boat out' is the definition.
(pole used to propel a boat)
'bet stake' is the wordplay.
'bet' becomes 'punt' (punting is a kind of betting).
'stake' becomes 'pole' (I can't justify this - if you can you should believe this answer much more).
'punt'+'pole'='PUNT POLE'
'and' is the link.
Can you help me to learn more?
(Other definitions for punt pole that I've seen before include "Means of propelling boat" , "gondolier uses one" .)