Crossword Genius

That of a packet of paste? (4)

Ross

I believe the answer is:

size

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'paste?' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

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(Other definitions for size that I've seen before include "Bigness; a sealant" , "gelatinous mixture" , "Physical magnitude" , "Extent; a sealant" , "Dimensions, magnitude" .)

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