Baths in rum, showing Bohemian spirit (7)
I believe the answer is:
absinth
'bohemian spirit' is the definition.
'baths in rum' is the wordplay.
'rum' indicates anagramming the letters (rum can mean strange or unusual).
'baths'+'in'='bathsin'
'bathsin' is an anagram of 'ABSINTH'.
'showing' acts as a link.
(Other definitions for absinth that I've seen before include "Strong green alcoholic drink" , "Potent liqueur, originally made with wormwood" , "Strong liquor in baths, strangely" , "Shrubby plant" , "Aniseed-flavoured liqueur" .)