The secret's out; it's come to light (7)
I believe the answer is:
cresset
'it's come to light' is the definition.
I can't judge whether this defines the answer.
'the secret's out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'secrets' anagrammed gives 'CRESSET'.
Can you help me to learn more?
(Other definitions for cresset that I've seen before include "Flaming torch" , "Formerly a light" , "Old torch" , "burning basket" , "Strange secrets of the beacon" .)