Defy gravity craftily? (5)

I believe the answer is:

hover

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'defy' is the definition.
The definition and answer can be both to do with fundamental existence as well as being verbs in their base form.
Maybe 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 hover that I've seen before include "Be stationary in the air" , "Remain stationary while aloft" , "Float above in the air, perhaps a craft" , "Remain in one place in the air" , "Remain suspended" .)

I've seen this clue in the Evening Standard.

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