Crossword Genius

The secret of self-assurance (10)

Ross

I believe the answer is:

confidence

I believe this is a double definition.

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

'self-assurance' is the second definition.
('confidence' can be a synonym of 'self-assurance')

'of' acts as a link.

(Other definitions for confidence that I've seen before include "Shared secret - belief" , "in which one's relations will not be mentioned" , "Trust" , "belief in one's own abilities" , "courage" .)

I've seen this clue in The Telegraph.
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