Suspect banker? (6,2,8)

I believe the answer is:

person of interest

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

'suspect' is the definition.
Although both the answer and definition are adjectives, they are not in the same form of the adjective.

'banker?' is the wordplay.
I cannot quite see how this works, but
'banker?' could be 'person' (banker is a kind of person) and 'person' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

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

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