Crossword Genius

Mass publication (6)

Ross

I believe the answer is:

volume

I believe this clue is a double definition.

'mass' is the first definition.
(volume is a kind of mass)

'publication' is the second definition.
(volume is a kind of publication)

(Other definitions for volume that I've seen before include "A book or sound dimension" , "Space occupied by an object" , "Amount of three-dimensional space occupied" , "Book; degree of loudness" , "work" .)

I've seen this clue in The Guardian.
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