Food and drink conference (4)

I believe the answer is:

diet

This clue is a double definition.

'food and drink' is the first definition.
(I've seen this before)

'conference' is the second definition.
(I've seen this before)

(Other definitions for diet that I've seen before include "See 19" , "go without sugar perhaps" , "Slimming regime" , "Try to lose weight" , "A restricted eating regime" .)

I've seen this clue in The Independent.

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