Revealing what is meant to be secret (8)

I believe the answer is:

telltale

(Other definitions for telltale that I've seen before include "Blabber of secrets" , "Betraying" , "Revealer of secrets" , "Blabber-mouth, can't keep a secret" , "Revealing indicator or sneak" .)

I've seen this clue in the Thinks.com.

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