Name of E number originally used in topping (8)
I believe the answer is:
ebenezer
'name' is the definition.
(man's name)
'e number originally used in topping' is the wordplay.
'originally' says to take the initial letters.
'used in' means one lot of letters goes inside another.
'topping' becomes 'beezer' (both are old-fashioned words for excellent).
The initial letter of 'number' is 'n'.
'n' put inside 'beezer' is 'benezer'.
'e'+'benezer'='EBENEZER'
'of' acts as a link.
(Other definitions for ebenezer that I've seen before include "someone cold" , "First name of Dickens's Scrooge" , "Christian name of Scrooge, miser" , "Scrooge's first name" , "__ Scrooge; Dickens character" .)