Musicians pass in it, travelling (8)
I believe the answer is:
pianists
'musicians' is the definition.
(pianist is a kind of musician)
'pass in it travelling' is the wordplay.
'travelling' indicates anagramming the letters.
'pass'+'in'+'it'='passinit'
'passinit' with letters rearranged gives 'PIANISTS'.
(Other definitions for pianists that I've seen before include "Pub performers sometimes" , "Brahms and Liszt, for example" .)