Excursion that reveals orientation? (6)

I believe the answer is:

outing

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'excursion' is the definition.
(synonyms)

I don't understand the rest of the clue.

(Other definitions for outing that I've seen before include "Day excursion" , "Excursion, trip" , "Excursion as for picnic" , "Expedition" , "that puts the private on parade?" .)

I've seen this clue in The Times.

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