Crossword Genius

Single young man admits not eating bread pronto (1,4,4)

Ross

I believe the answer is:

a fast buck

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

'admits not eating bread pronto' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'single young man' is the wordplay.
I cannot really understand how this works, but
'single' could be 'a' and 'a' is found in the answer.
'man' could be 'buck' (I have seen 'young man' mean 'buck' so perhaps 'man' could also mean 'buck') and 'buck' is found in the answer.
The remaining letters 'fast' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for a fast buck that I've seen before include "easily made money" , "killing?" , "One wild young fellow" , "Easy profit" , "Does find it difficult to go along with this" .)

I've seen this clue in The Times.
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