Crossword Genius

Sighs audibly at the sheer magnitude (4)

Ross

I believe the answer is:

size

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

'the sheer magnitude' is the definition.
'size' can be an answer for 'magnitude' (size is a kind of magnitude). I am unsure of the 'the sheer' bit.

'sighs audibly' is the wordplay.
'audibly' shows a homophone (sound like).
'sighs' sounds like 'SIZE'.

'at' acts as a link.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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