Exposing one’s secret on the excursion (6)

I believe the answer is:

outing

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This could be a double definition.

'exposing one's secret' is the first definition.
'outing' can be an answer for 'exposing' (outing is a kind of exposing). I am unsure of the 'one's secret' bit.

'the excursion' is the second definition.
(synonyms)

'on' is the link.

Can you help me to learn more?

(Other definitions for outing that I've seen before include "Short pleasure trip" , "Revealing orientation" , "Excursion, trip" , "Jaunt" , "journey" .)

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