Show pride in conscientious truthfulness (5)

I believe the answer is:

strut

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'show pride' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'in conscientious truthfulness' is the wordplay.
'in' indicates a hidden word.
'STRUT' is hidden in the letters of 'conscientious truthfulness'.

Can you help me to learn more?

(Other definitions for strut that I've seen before include "Walk proudly; bar" , "Supportive member" , "Walk pompously" , "Strengthening bar" , "Display arrogance" .)

I've seen this clue in the Evening Standard.

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