Strut around in confidence (5)
I believe the answer is:
trust
'confidence' is the definition.
(I know that confidence can be written as trust)
'strut around' is the wordplay.
'around' indicates anagramming the letters.
'strut' anagrammed gives 'TRUST'.
'in' acts as a link.
(Other definitions for trust that I've seen before include "'Put your . . . . . In God, and keep your powder dry'" , "commercial credit" , "Faith (in a business combination?)" , "assurance" , "Believe" .)