I'm off food completely (8)

I believe the answer is:

farewell

'i'm off' is the definition.

'food completely' is the wordplay.
'food' becomes 'fare' (fare is a kind of food**).
'completely' becomes 'well'.
'fare'+'well'='FAREWELL'

(Other definitions for farewell that I've seen before include "Valedictory word" , "Say goodbye" , "All the best" , "Archaic goodbye - good luck" , "Wish on leave-taking" .)

I've seen this clue in The Times.

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