Crossword Genius

Not a lot of money for snack food (7)

Ross

I believe the answer is:

peanuts

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

'not a lot of money' is the definition.
I can't tell whether this defines the answer.

'snack food' is the wordplay.
'snack' becomes 'peanut' (I've seen this before).
'food' becomes 's' (I can't justify this - if you can you should believe this answer much more).
'peanut'+'s'='PEANUTS'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for peanuts that I've seen before include "Popular edible seed pods" , "what could make up a packet?" , "pittance" , "Cartoon strip; tiny sum" , "Paltry sum of money" .)

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