Crossword Genius

One of the less wise things to eat? (6)

Ross

I believe the answer is:

rasher

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

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

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(Other definitions for rasher that I've seen before include "item at breakfast" , "More imprudent" , "more headstrong" , "pig, to an extent" , "Thin strip of bacon" .)

I've seen this clue in the Evening Standard.
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