Band's journey in the Home Counties (6)
I believe the answer is:
stripe
'band's' is the definition.
(synonyms)
'journey in the home counties' is the wordplay.
'journey' becomes 'trip' (trip is a kind of journey).
'in' is an insertion indicator.
'the home counties' becomes 'se' (Home Counties in the South East of England).
'trip' put into 'se' is 'STRIPE'.
(Other definitions for stripe that I've seen before include "Military mark of rank, chevron" , "promotion, maybe" , "Band of colour, maybe of rank" , "Piece of braid indicating military rank" , "Chevron on a uniform to denote military rank" .)