Coins covering northern hills in England (8)

I believe the answer is:

pennines

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

'in england' is the definition.
(I know that Pennines is part of England)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pennines that I've seen before include "Backbone of England" , "English mountain range" , "chain of hills" , "Range of hills in England" .)

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