Nestled among azalea, N.T. officer's shed? (4-2)

I believe the answer is:

lean-to

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

I can't explain the rest of the clue.

(Other definitions for lean-to that I've seen before include "Add-on building" , "Building built against another" , "Rough shelter lying against the wall of a building" , "Building put up against another" , "Building supported by another" .)

I've seen this clue in The Everyman puzzle in The Observer.

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