Religious group caught in position (4)
I believe the answer is:
sect
'religious group' is the definition.
(I've seen this before)
'caught in position' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'in' is an insertion indicator.
'position' becomes 'set' ('set' can be a synonym of 'position'**).
'c' put inside 'set' is 'SECT'.
(Other definitions for sect that I've seen before include "Small group with own religious beliefs" , "Dissenting division of a larger religious group" , "Subdivision of a larger religious group" , "School, faction" , "Group of people with unusual religious beliefs" .)