Forever restricting grassland for walks (9)

I believe the answer is:

alleyways

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'walks' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

'forever restricting grassland' is the wordplay.
'forever' becomes 'always' (I've seen this before).
'restricting' means one lot of letters goes inside another.
'grassland' becomes 'ley' (ley is a kind of grassland).
'always' enclosing 'ley' is 'ALLEYWAYS'.

'for' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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