More than one drink is bad, we hear (4)
I believe the answer is:
ales
'more than one drink' is the definition.
(ale is a kind of drink)
'is bad we hear' is the wordplay.
'is bad' becomes 'ails' (ail can mean to suffer or be ill).
'we hear' indicates a 'sounds like' (homophone) clue.
'ails' is a homophone of 'ALES'.
(Other definitions for ales that I've seen before include "What might be delivered by pumps" , "Alcoholic drinks" , "A sale of beers" , "Types of beer" .)