Ban this rum drink (7)
I believe the answer is:
absinth
'drink' is the definition.
(absinth is a kind of drink)
'ban this rum' is the wordplay.
'rum' indicates an anagram (rum can mean strange or unusual).
'ban'+'this'='banthis'
'banthis' is an anagram of 'ABSINTH'.
(Other definitions for absinth that I've seen before include "sort of liqueur" , "Strong liqueur with wormwood and anise" , "(Originally) a wormwood-based liqueur" , "Strong liquor in baths, strangely" , "Shrubby plant" .)