The first composer to journey (6)
I believe the answer is:
travel
'journey' is the definition.
('travel' can be a synonym of 'journey')
'the first composer' is the wordplay.
'first' indicates taking the first letters.
'composer' becomes 'ravel' (I've seen this before).
The initial letter of 'the' is 't'.
't'+'ravel'='TRAVEL'
'to' acts as a link.
(Other definitions for travel that I've seen before include "Go on a trip" , "Varlet (anag.)" , "Journey from one place to another" , "tour" , "Move from one place to another" .)