Concerned with highbrow narcissist’s favourite subject? (7)

I believe the answer is:

metopic

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'concerned' is the definition.
Both the definition and answer are adjectives.
Perhaps there's a link between them I don't understand?

'highbrow narcissist's favourite subject?' is the wordplay.
'highbrow narcissist's favourite' becomes 'me' (I can't justify this - if you can you should believe this answer much more).
'subject?' becomes 'topic' (as in a topic for discussion).
'me'+'topic'='METOPIC'

'with' acts as a link.

Can you help me to learn more?

(Another definition for metopic that I've seen is " Relating to the forehead".)

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

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