It is not representative of appropriate skill (8,3)

I believe the answer is:

abstract art

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

'it is not representative' is the definition.
The definition suggests a singular noun which matches the answer.

'appropriate skill' is the wordplay.
'appropriate' becomes 'abstract' (I've seen this before).
'skill' becomes 'art' (both can mean a talent).
'abstract'+'art'='ABSTRACT ART'

'of' acts as a link.

Can you help me to learn more?

(Another definition for abstract art that I've seen is " Nonrepresentational paintings, sculpture etc".)

I've seen this clue in The Times.

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