Crossword Genius

Volume of whispers picked up (4)

Ross

I believe the answer is:

size

I'm a little stuck... Click here to teach me more about this clue!

'volume' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for size that I've seen before include "Magnitude; glue" , "Physical magnitude" , "Dimensions, magnitude" , "stiffener" , "gelatinous mixture" .)

I've seen this clue in The Guardian.
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