Bans cheers with drinks, we hear (6)
I believe the answer is:
taboos
'bans' is the definition.
(I've seen this in another clue)
'cheers with drinks we hear' is the wordplay.
'cheers' becomes 'ta' (both can informally mean thank you).
'with' says to put letters next to each other.
'drinks' becomes 'booze' (alcoholic drinks).
'we hear' indicates a 'sounds like' (homophone) clue.
'booze' is a homophone of 'boos'.
'ta'+'boos'='TABOOS'
(Other definitions for taboos that I've seen before include "restrictions" , "Religious or superstitious prohibitons" , "Prejudices that prohibit the mention of something" , "Prohibitions on things not to be done" , "They're forbidden by religion or social custom" .)