Tattletale

I think it could be either:

Which length description are you looking for?:

rat

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

This is the entire clue.

(Other definitions for rat that I've seen before include "Betrayer" , "Tell-tale" , "Destructive rodent" , "Domestic rodent" , "one escaping doomed vessel?" .)

I've seen this clue in The New York Times.

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