Opponent with weapon trapping a West Indian (8)
I believe the answer is:
antiguan
'west indian' is the definition.
(Antiguan is an example)
'opponent with weapon trapping a' is the wordplay.
'opponent' becomes 'anti' (I've seen this before).
'with' means one lot of letters go next to another.
'weapon' becomes 'gun' (I've seen this before).
'trapping' is an insertion indicator.
'gun' going around 'a' is 'guan'.
'anti'+'guan'='ANTIGUAN'
(Other definitions for antiguan that I've seen before include "West Indian" , "from the West Indies" , "From a Caribbean island paired with Barbuda" , "Islander" .)