Crossword Genius

Lobby vocally against dictionary thats incomplete

Ross

I believe the answer is:

antechamber

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'lobby' is the definition.
(I know this)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for antechamber that I've seen before include "External room" , "Small room before a larger one" , "Small entrance room" , "Small room leading to a main one" , "Reception area" .)

I've seen this clue in The Daily Mail.
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