Stakes that are added later (4,4)

'are added later' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'stakes' is the wordplay.
I cannot quite understand how this works, but
'stakes' could be 'bets' ('bet' can be a synonym of 'stake') and 'bets' is located in the answer.
The remaining letters 'side' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'that' is the link.

Can you help me to learn more?