Violinist’s last seen on composer’s journeys (7)
I believe the answer is:
travels
'journeys' is the definition.
('travel' can be a synonym of 'journey')
'violinist's last seen on composer's' is the wordplay.
'last' says to take the final letters.
'seen on' is a charade indicator (letters next to each other).
'composer's' becomes 'ravels'.
The last letter of 'violinist' is 't'.
't'+'ravels'='TRAVELS'
(Other definitions for travels that I've seen before include "An account of journeys" , "'Gulliver's --'" , "See 10 Down" , "Goes from one place to another" , "Works as salesman" .)