Crossword Genius

A number of sheets - about a thousand? (4)

Ross

I believe the answer is:

ream

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

'a number of sheets' is the definition.
'ream' can be an answer for 'sheets' (I've seen this before). I'm unsure of the 'a number of' bit.

'about a thousand?' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'thousand?' becomes 'M' (Roman numeral for a thousand).
're'+'a'+'m'='REAM'

Can you help me to learn more?

(Other definitions for ream that I've seen before include "20 quires of paper" , "stock of paper" , "Twenty quires of paper" , "Five hundred sheets of paper" , "Widen (hole); quantity of paper" .)

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