Crossword Genius

Just one crisp slice, perhaps (6)

Ross

I believe the answer is:

potato

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This clue could be a double definition.

'just one crisp' is the first definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe there's an association between them I don't understand?

'slice perhaps' is the second definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for potato that I've seen before include "Raleigh brought it from America" , "French wine region" , "Tuber, popular in Ireland" , "Plant tuber eaten as a vegetable" , "Common vegetable" .)

I've seen this clue in the Evening Standard.
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