Crossword Genius

Open secret, Charlie’s gone (5)

Ross

I believe the answer is:

overt

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'open' is the definition.
(associated in meaning)

I cannot understand how the remainder of the clue works.

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(Other definitions for overt that I've seen before include "Done in an obvious way" , "Clear" , "Open, not 1 across" , "Open and observable" , "Obvious, patent" .)

I've seen this clue in The Hindu.
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