Simpleton's food (6)

I believe the answer is:

noodle

This clue is a double definition.

'simpleton's' is the first definition.
(I've seen this before)

'food' is the second definition.
(noodle is a kind of food)

(Other definitions for noodle that I've seen before include "Simpleton; piece of pasta" , "Simpleton - strip of pasta" , "Slangy head or pasta strip" , "Goose" , "Thin pasta strip" .)

I've seen this clue in The Telegraph.

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