Crossword Genius

The provision, for money, of a small drink (4)

Ross

I believe the answer is:

sale

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

'the provision for money' is the definition.
I can't tell whether this definition defines the answer.

'a small drink' is the wordplay.
'a small' becomes 's' (abbreviation - e.g. clothes size).
'drink' becomes 'ale' (type of beer).
's'+'ale'='SALE'

'of' is the link.

Can you help me to learn more?

(Other definitions for sale that I've seen before include "Offer period" , "From which one may get bargains" , "Bargain-price event" , "Transaction" , "Period of reduced prices" .)

I've seen this clue in the Evening Standard.
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