Place where builder of dam constructs masonry? (5)

I believe the answer is:

lodge

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'masonry?' is the definition.
(masonry is a kind of lodge)

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

(Other definitions for lodge that I've seen before include "Settle" , "Beaver's nest" , "group of masons" , "Cottage at the entrance to the grounds of a big house" , "Stay temporarily, with bed and board" .)

I've seen this clue in The Telegraph.

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