Sneak (8)

I think it could be either:

Which length description are you looking for?:

telltale

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

This is all the clue.

(Other definitions for telltale that I've seen before include "Person revealing secrets" , "Blabbermouth, snitch" , "Blabber-mouth, can't keep a secret" , "Revealing indicator or sneak" , "One revealing secrets" .)

I've seen this clue in the Evening Standard and The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.