Creature a member of religious organisation? (6)

I believe the answer is:

insect

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'creature' is the definition.
(insect is a kind of creature)

'a member of religious organisation?' is the wordplay.
'a member of religious' becomes 'in' (I can't justify this - if you can you should give a lot more credence to this answer).
'organisation?' becomes 'sect' (sect is a kind of organization).
'in'+'sect'='INSECT'

Can you help me to learn more?

(Other definitions for insect that I've seen before include "Eg, beetle or bee" , "cricket, maybe" , "Imago" , "Eg, ant" , "Contemptible person" .)

I've seen this clue in The Telegraph.

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