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