An expert at throwing and catching (7)
I believe the answer is:
juggler
'an expert' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for juggler that I've seen before include "Balls-in-air entertainer" , "One performs tricks of manual dexterity" , "Circus performer" , "Conjuror" , "One keeping several things in the air" .)