Sentimental stuff - money for food (9)

I believe the answer is:

cornbread

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'sentimental stuff' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'money for food' is the wordplay.
'money' becomes 'bread' (bread is slang for money).
'for' means one lot of letters go next to another (I've seen this in other clues).
'food' becomes 'corn' (corn is a kind of food).
'bread' after 'corn' is 'CORNBREAD'.

Can you help me to learn more?

I've seen this clue in The Mirror.

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