A bit tricky to keep silent when running after wildlife (6)

I believe the answer is:

elfish

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'running after wildlife' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for elfish that I've seen before include "Mischievous" , "Tricky" .)

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

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