Consumption makes a comeback during week at Nice (6)
I believe the answer is:
intake
'consumption' is the definition.
(synonyms)
'a comeback during week at nice' is the wordplay.
'a comeback' says the letters should be written in reverse.
'during' indicates the answer is hidden within the clue.
'ekatni' is hidden in the letters of 'week at nice'.
'ekatni' back-to-front is 'INTAKE'.
'makes' acts as a link.
(Other definitions for intake that I've seen before include "Place where gas or water enters" , "Body of new pupils" , "new kids?" , "Entry for air, etc" , "Number of acceptances as in school" .)