Like a cheetah - with sharp teeth and claws? (5)

I believe the answer is:

nippy

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'like' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for nippy that I've seen before include "Very cold - quick (informal)" , "Sharp" , "Slightly cold?" , "Cold - nimble" , "Able to move quickly" .)

I've seen this clue in The Guardian.

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