Crossword Genius

Cash allowance to be decided by beginning of week, ok to go back outside (8,5)

Ross

I believe the answer is:

spending money

'cash allowance' is the definition.
(allowance of money for spending)

I don't understand how the remainder of the clue works.

(Other definitions for spending money that I've seen before include "Cash in your pocket" , "Cash to use for retail therapy?" , "Allowance for small personal expenses" , "Child's weekly allowance" .)

I've seen this clue in The Times.
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