Expert at throwing catches (7)

I believe the answer is:

juggler

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'expert' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for juggler that I've seen before include "One performs tricks of manual dexterity" , "Circus performer" , "Conjuror" , "Balls-in-air entertainer" , "One keeping several things in the air" .)

I've seen this clue in the Evening Standard.

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