Unoriginal thing for a landlord to do? (5)

I believe the answer is:

relet

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'do?' is the definition.
Both the answer and definition are verbs in their base form.
Maybe there's a link between them I don't understand?

I don't understand how the rest of the clue works.

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(Other definitions for relet that I've seen before include "Rent out (room) again" , "hire out again" , "Grant tenancy again" , "have another tenant" , "take in new tenant" .)

I've seen this clue in the Evening Standard.

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