Lift up belly in prize pool (7)

I believe the answer is:

jackpot

I'm a little stuck... Click here to teach me more about this clue!

'prize pool' is the definition.
'jackpot' can be an answer for 'pool' (pool of winnings or prize money). I'm not certain of the 'prize' bit.

'lift up belly' is the wordplay.
'lift up' becomes 'jack' (jacking is a kind of lifting. I am not sure about the 'up' bit.).
'belly' becomes 'pot' (as in a pot belly).
'jack'+'pot'='JACKPOT'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for jackpot that I've seen before include "more than just change for the better" , "Large cash prize" , "Cumulative prize" , "best prize!" , "Accumulated prize" .)

I've seen this clue in the Evening Standard.

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