Ain't sick on a fair amount of hike with consumption
I believe the answer is:
intake
'consumption' is the definition.
('intake' can be a synonym of 'consumption')
'ain't sick on a fair amount of' is the wordplay.
'sick' indicates anagramming the letters.
'on' is a charade indicator (letters next to each other).
'a fair amount of' becomes 'ke' (I can't explain this - if you can you should believe this answer much more).
'aint' anagrammed gives 'inta'.
'inta'+'ke'='INTAKE'
'hike with' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for intake that I've seen before include "Number of acceptances as in school" , "Entry to a jet engine" , "Place where gas or water enters" , "new kids?" , "Group of new pupils in a school" .)