Unit go on tour! (6)

I believe the answer is:

outing

I'm a little stuck... Click here to teach me more about this clue!

'tour' is the definition.
(an outing is a tour or trip)

'unit go' is the wordplay.
'unit go' can be anagrammed to 'OUTING'.
But, I'm unsure how this is indicated.

'on' acts as a link.

Can you help me to learn more?

(Other definitions for outing that I've seen before include "Jaunt" , "Expedition" , "A trip in the open air" , "Excursion as for picnic" , "Day trip" .)

I've seen this clue in The Irish Times.

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