Dangerous snakes (4)

I think it could be either:

Which length description are you looking for?:

asps

'dangerous snakes' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for asps that I've seen before include "Poplars" , "Egyptian cobras" , "Cleopatra's snakes" , "Poisonous snakes" , "poisonous things" .)

I've seen this clue in the Penny Press.

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