Sickness has student going back for food (7)

I believe the answer is:

aliment

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'for food' is the definition.
(aliment is a kind of food)

I can't explain the remainder of the clue.

(Other definitions for aliment that I've seen before include "Old word for food" , "Nourishment" , "Sustenance" , "Something which nourishes - meal tin (anag)" .)

I've seen this clue in The Telegraph.

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