Nile reptile (3)

I think it could be either:

Which length description are you looking for?:

asp

'nile reptile' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for asp that I've seen before include "Snake seen in a spa, strangely" , "Kind of snake - what a sap" , "Snake of the Nile" , "Predatory fish" , "snake appears" .)

I've seen this clue in the LA Times, The New York Times, The Wall Street Journal and the King Feature Syndicate.

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