Bug belonging to religious group? (6)
I believe the answer is:
insect
'bug' is the definition.
(bug can mean an insect)
'belonging to religious group?' is the wordplay.
'belonging to' becomes 'in' (I've seen this in other clues).
'religious group?' becomes 'sect' (eg a religious sect).
'in'+'sect'='INSECT'
(Other definitions for insect that I've seen before include "Praying mantis, say" , "Possibly fly" , "Worker, possibly" , "A fly, for instance" , "Contemptible type" .)