Bet on clubs without experience, then left pools activity? (4-5)

'pools activity?' is the definition.
I know nothing about this answer so I can't tell whether this works.

'bet on clubs without experience then left' is the wordplay.
'bet on' becomes 'back' (I've seen this in another clue).
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'without experience' becomes 'raw' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'then' means one lot of letters go next to another.
'left' becomes 'l' (common abbreviation).
'back'+'c'+'raw'+'l'='BACK-CRAWL'

Can you help me to learn more?