Nimble osprey has no oxygen, no energy (4)

I believe the answer is:

spry

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'nimble' is the definition.
(I know that nimble can be written as spry)

I can't explain the remainder of the clue.

(Other definitions for spry that I've seen before include "Far from doddering" , "Moving quickly and lightly" , "'Active and lively, nimble (4)'" , "Still able to move lightly and fast" , "Fleet" .)

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

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