Crossword Genius

Secret signal (8)

Ross

I believe the answer is:

intimate

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'secret' is the first definition.
(thesaurus)

'signal' is the second definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?

Can you help me to learn more?

(Other definitions for intimate that I've seen before include "Give hint to close friend?" , "Personal - hint - friend" , "Thick" , "Infer; personal" , "Sharing a close and affectionate friendship" .)

I've seen this clue in The Times, The Sunday Times and The Independent.
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