Hull flu invalid gets a lot of booze (7)
I believe the answer is:
skinful
'a lot of booze' is the definition.
'hull flu invalid' is the wordplay.
'hull' becomes 'skin' (both can mean to remove a covering).
'invalid' indicates anagramming the letters.
'flu' anagrammed gives 'ful'.
'skin'+'ful'='SKINFUL'
'gets' acts as a link.
(Other definitions for skinful that I've seen before include "enough to get drunk" , "An excess of alcohol" , "amount of alcohol" , "More than enough beer!" , "a lot getting sunk" .)