Clock ready for money down (4,4)

I believe the answer is:

spot cash

'money down' is the definition.
(a down payment)

'clock ready' is the wordplay.
'clock' becomes 'spot' (clock can mean to notice or spot).
'ready' becomes 'cash' (ready can informally mean cash).
'spot'+'cash'='SPOT CASH'

'for' is the link.

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.