Brisk lecture skipped any introduction (4)

I believe the answer is:

spry

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'brisk' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for spry that I've seen before include "Lively (especially of an older person)" , "Still able to move lightly and fast" , "'Agile, nimble (4)'" , "Moving quickly and lightly" , "Far from doddering" .)

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

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