One getting a kick out of betting (6)
I believe the answer is:
punter
'one getting a' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'kick out of betting' is the wordplay.
'kick' becomes 'punt' (punt is a kind of kick).
'out of' means to remove the last letter (I've seen 'out' mean this).
'betting' becomes 'ter' (I am not sure about this - if you are sure you should believe this answer much more).
'punt' with its last letter taken away is 'pun'.
'pun'+'ter'='PUNTER'
Can you help me to learn more?
(Other definitions for punter that I've seen before include "boater" , "Professional gambler; client (inf.)" , "Informally, a customer or someone who bets" , "Better - rugby player - river boatman" , "A colloquial better or a regular client" .)