Vocalist drunk on recent tour (12)
I believe the answer is:
countertenor
'vocalist' is the definition.
(countertenor is a kind of vocalist)
'drunk on recent tour' is the wordplay.
'drunk' indicates an anagram.
'on'+'recent'+'tour'='onrecenttour'
'onrecenttour' with letters rearranged gives 'COUNTERTENOR'.
(Other definitions for countertenor that I've seen before include "Highest male singing voice" , "he'll sing" , "Singer" , "Adult male with an alto voice" , "being highly vocal" .)