Titled gent came back and put two rounds inside the chamber (4)

I believe the answer is:

room

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'the chamber' is the definition.
(I've seen this in another clue)

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

(Other definitions for room that I've seen before include "basic accommodation" , "Latitude" , "See 17" , "See 1" , "Chamber; scope" .)

I've seen this clue in The Irish Times.

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