Expertise, or pieces of adroitness (3)

I believe the answer is:

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This clue might be a double definition.

'expertise' is the first definition.
(I've seen this before)

'pieces of adroitness' is the second definition.
'art' can be an answer for 'adroitness' (thesaurus). I am not certain of the 'pieces of' bit.

'or' acts as a link.

Can you help me to learn more?

(Other definitions for art that I've seen before include "Creative works; skill" , "Drawing" , "eg Painting" , "Paintings etc." , "This gallery displays paintings" .)

I've seen this clue in the Evening Standard.

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