Case of an insect flying off (8)

I believe the answer is:

instance

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

'case' is the definition.
(I know that case can be written as instance)

'an insect flying off' is the wordplay.
'an insect' can be anagrammed to 'INSTANCE'.
However, I am not clear how this is indicated.

'of' is the link.

Can you help me to learn more?

(Other definitions for instance that I've seen before include "Occasion" , "Specimen" , "Cite as an example" , "Canniest (anag) - occurrence" , "Example or single occurrence of something" .)

I've seen this clue in the Sydney Morning Herald.

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