Crossword Genius

Use your money to get by, as mentioned (3)

Ross

I believe the answer is:

buy

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

'use' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

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

Can you help me to learn more?

(Other definitions for buy that I've seen before include "Purchase" , "Accept truth of (colloq.)" , "Get" , "Procure" .)

I've seen this clue in the Evening Standard.
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