Beer that's disgusting - bother drinking it? (7)
I believe the answer is:
draught
'beer' is the definition.
(draught beer is a type of beer)
'disgusting bother drinking it?' is the wordplay.
I cannot really see how this works, but
'disgusting' could be 'ugh' and 'ugh' is found within the answer.
'bother' could be 'drat' (exclamation of annoyance) and 'drat' is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for draught that I've seen before include "intake" , "Current - drink - drawing - checker" , "One short of cash feels this" , "it's felt, when short of cash" , "Dose of medicine" .)