His skill is nominal (3)

I believe the answer is:

art

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

'his skill' is the definition.
'art' can be an answer for 'skill' (both can mean a talent). I'm not sure about the 'his' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for art that I've seen before include "Creative works; knack" , "Lovely piece of work" , "For example, Blakey's creative" , "Drawing" , "Expertise" .)

I've seen this clue in the Evening Standard.

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