Get a hundred and twenty-four sheets (7)
I believe the answer is:
acquire
'get' is the definition.
(synonyms)
'a hundred and twenty-four sheets' is the wordplay.
'hundred' becomes 'c' (Roman numeral).
'and' says to put letters next to each other.
'twenty-four sheets' becomes 'quire' (quire can mean 24 sheets of paper).
'a'+'c'+'quire'='ACQUIRE'
(Other definitions for acquire that I've seen before include "Come to possess" , "Bag" , "Secure" , "Get" , "Come into possession of" .)