Connoisseur of beastly habits squeezed zits outside flipping work toilet! (9)

I believe the answer is:

zoologist

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'connoisseur' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I don't see?

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

Can you help me to learn more?

(Other definitions for zoologist that I've seen before include "eg David Attenborough" , "Scientist studying animals" , "Animal scientist" , "Scientist in the study of animals" , "animal student" .)

I've seen this clue in The Independent.

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