Band journey through Home Counties (6)
I believe the answer is:
stripe
'band' is the definition.
('stripe' can be a synonym of 'band')
'journey through home counties' is the wordplay.
'journey' becomes 'trip' (trip is a kind of journey).
'through' is an insertion indicator (I've seen this in other clues).
'home counties' becomes 'se'.
'trip' inserted into 'se' is 'STRIPE'.
(Other definitions for stripe that I've seen before include "Sleeve badge showing military rank" , "24 across (anag)" , "Length of material, maybe showing rank" , "Piece of braid indicating military rank" , "Sign of a soldier's rank" .)