Crossword Genius

Narrow roads making up a wide one? (5)

Ross

I believe the answer is:

lanes

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

'narrow roads' is the definition.
'lanes' can be an answer for 'roads' (I've seen this in other clues). I'm not sure about the 'narrow' bit.

'up a wide one?' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is found within the answer.
The remaining letters 'les' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'making' is the link.

Can you help me to learn more?

(Other definitions for lanes that I've seen before include "Leans into narrow roads" , "Tracks for traffic" , "Narrow roads or road divisions" , "Narrow tracks or paths" , "Country roads" .)

I've seen this clue in the Evening Standard.
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