Round trip? (8,4)

I think it could be either:

Which length description are you looking for?:

8,4

circular tour

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

But I've got no explanation for this one! Could you help me understand?

I've seen this clue in The Irish News and The Globe and Mail.

Want a hint initially instead of a full solution? Install my app