Clan member carries first of trophies across busy road (8)
I believe the answer is:
totemist
'clan member' is the definition.
(member of a clan with a shared totem)
'carries first of trophies across busy road' is the wordplay.
'carries' becomes 'totes' (toting is a kind of carrying).
'first of trophies' becomes 't' (1st letter of 'trophies').
'across' is an insertion indicator.
'busy road' becomes 'MI' (resembles M1, English motorway).
'totes'+'t'='totest'
'totest' placed around 'mi' is 'TOTEMIST'.
(Other definitions for totemist that I've seen before include "venerated individual" , "North American Indian who worships" .)