Worker in travel crew (10)
I believe the answer is:
journeyman
'worker' is the definition.
(journeyman is a kind of worker)
'travel crew' is the wordplay.
'travel' becomes 'journey' (synonyms).
'crew' becomes 'man' (both can mean to staff or operate something).
'journey'+'man'='JOURNEYMAN'
'in' is the link.
(Other definitions for journeyman that I've seen before include "Adequately competent worker" , "Competent, but not exceptional, worker" , "hired worker" .)