The secret is boldness (10)

I believe the answer is:

confidence

This clue is a double definition.

'the secret' is the first definition.
(confidence is a kind of secret)

'is boldness' is the second definition.
(thesaurus)

(Other definitions for confidence that I've seen before include "Private" , "belief in one's own abilities" , "communication of faith" , "conviction" , "Shared secret - belief" .)

I've seen this clue in The Globe and Mail.

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