Landlord with lots on deposit (4,4)

I believe the answer is:

mine host

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

'landlord' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Another definition for mine host that I've seen is " Landlord".)

I've seen this clue in The Guardian.

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