Allow the tenant to move in (3)

I believe the answer is:

let

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'allow' is the definition.
(I know that allow can be written as let)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for let that I've seen before include "inefficient service" , "Won't stop you" , "Allow or rent" , "Umpire's decision" , "Permit; lease" .)

I've seen this clue in The Globe and Mail.

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