Our calf's butchered for consumption (8)
I believe the answer is:
scrofula
'for consumption' is the definition.
(thesaurus)
'our calf's butchered' is the wordplay.
'butchered' indicates anagramming the letters (I've seen this in other clues).
'our'+'calfs'='ourcalfs'
'ourcalfs' anagrammed gives 'SCROFULA'.
(Other definitions for scrofula that I've seen before include "King's evil - foul scar (anag)" , "A disease of flour sac causing glandular swellings" , "Old disease" .)