Crossword Genius

Room still lacking support walls, we hear (5)

Ross

I believe the answer is:

attic

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'room' is the definition.
(type of room)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for attic that I've seen before include "The highest room" , "Top apartment" , "Greek - upper room" , "Room inside a building's roof space" , "Athenian - garret" .)

I've seen this clue in the Sydney Morning Herald.
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