Cult adopting unique selling point is dubious (7)

I believe the answer is:

suspect

I'm a little stuck... Click here to teach me more about this clue!

'dubious' is the definition.
(I've seen this before)

'cult adopting unique selling point' is the wordplay.
'cult' becomes 'sect' (I've seen this before).
'adopting' is an insertion indicator.
'unique selling point' becomes 'usp' (this could be a standard abbreviation which I don't know about).
'sect' placed around 'usp' is 'SUSPECT'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for suspect that I've seen before include "Person being accused" , "Funny" , "Imagine to be true" , "One thought to have committed crime" , "Doubt; mistrust" .)

I've seen this clue in The Guardian.

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