Lizards at long last giving audible echoes (6)

I believe the answer is:

geckos

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

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

(Other definitions for geckos that I've seen before include "Lizards with adhesive feet" , "Tropical lizards that climb walls" .)

I've seen this clue in the Evening Standard.

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