Travelling crew-member thus could be authorised for reassembly (6)
I believe the answer is:
roadie
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for roadie that I've seen before include "Star's assistant" , "Band crew member" , "Movement into a place" , "Touring band's supporter" , "Member of rock band's crew" .)