Bar’s better with piano for music, in the end (5)
I believe the answer is:
crown
'bar's' is the definition.
(thesaurus)
'better with piano for music in the end' is the wordplay.
'better' is an anagram indicator (with an improved letter-order).
'with' becomes 'w' (abbreviation).
'the end' suggests the final letters.
The last letters of 'piano for music in' are 'orcn'.
'w'+'orcn'='worcn'
'worcn' with letters rearranged gives 'CROWN'.
(Other definitions for crown that I've seen before include "Top of the head; coin" , "'Uneasy lies the head that wears a . . . . .'" , "piece of tooth" , "honour" , "sporting award" .)