Religious group has victory right inside channel (7)
I believe the answer is:
culvert
'channel' is the definition.
(culvert is a kind of channel)
'religious group has victory right' is the wordplay.
'religious group' becomes 'cult' (I've seen this before).
'has' means one lot of letters goes inside another.
'victory' becomes 'VE' (VE is short for Victory in Europe).
'right' becomes 'r' (common abbreviation).
've'+'r'='ver'
'cult' placed around 'ver' is 'CULVERT'.
'inside' acts as a link.
(Other definitions for culvert that I've seen before include "Water channel" , "Drain that crosses under a road or path" , "Drain crossing a road" , "Under-road drain" , "Tunnelled drain for water" .)