Dodgy cult claims universal knowledge (7)

I believe the answer is:

suspect

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

'cult claims universal knowledge' is the wordplay.
'cult' becomes 'sect' (religious sect).
'claims' is an insertion indicator.
'universal knowledge' becomes 'usp' (I can't justify this - if you can you should give a lot more credence to this answer).
'sect' enclosing 'usp' is 'SUSPECT'.

Can you help me to learn more?

(Other definitions for suspect that I've seen before include "Imagine to be true" , "Dodgy" , "Believe (something) possible or probable" , "Person being accused" , "Have misgivings about" .)

I've seen this clue in The Independent.

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