Restrictions that are in force for some years (3,6)

I believe the answer is:

age limits

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'restrictions' is the definition.
Both the answer and definition are plural nouns.
Perhaps they are linked in a way I don't understand?

'are in force for some years' is the wordplay.
'are in force' becomes 'limits' (I can't justify this - if you can you should give a lot more credence to this answer).
'for' says to put letters next to each other (I've seen this in other clues).
'some years' becomes 'age' (period of many years).
'limits' put after 'age' is 'AGE LIMITS'.

'that' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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