Crossword Genius

Blocks of paper are wasted on manuscript (5)

Ross

I believe the answer is:

reams

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'blocks of paper' is the definition.
I know that 'paper' relates to this answer. I also know that both the answer and definition are plural nouns

'are wasted on manuscript' is the wordplay.
'wasted' indicates anagramming the letters.
'on' is a charade indicator (letters next to each other).
'manuscript' becomes 'ms' (abbreviation for manuscript).
'are' anagrammed gives 'rea'.
'rea'+'ms'='REAMS'

Can you help me to learn more?

(Other definitions for reams that I've seen before include "This much paperwork" , "Large quantities (of paper?)" , "Scrapes the barrel" , "a very large amount" , "Large quantity of written matter" .)

I've seen this clue in The Mirror.
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