Look pleased after cycling - it’s a long way (5)

I believe the answer is:

miles

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

'a long way' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for miles that I've seen before include "Imperial units of length" , "'But I have promises to keep, and . . . . . to go before I sleep' (Frost)" , "Distance units" , "a long way" .)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.