Pleb or patrician set up circumscribed inquiry (5)

I believe the answer is:

probe

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

'inquiry' is the definition.
(I know that probe is a type of inquiry)

'pleb or patrician set up circumscribed' is the wordplay.
'PROBE' is hidden backwards within the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for probe that I've seen before include "Question or examine closely" , "Spacecraft; investigation" , "Question or examine thoroughly" , "Poke into" , "Explore, examine" .)

I've seen this clue in the Sydney Morning Herald.

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