Score and go off with mean person (7)
I believe the answer is:
scrooge
'mean person' is the definition.
(I've seen this before)
'score and go off' is the wordplay.
'and' means one lot of letters go next to another.
'off' indicates anagramming the letters.
'score'+'go'='scorego'
'scorego' is an anagram of 'SCROOGE'.
'with' acts as a link.
(Other definitions for scrooge that I've seen before include "One mean with money" , "'A Christmas Carol' character" , "Dickens' skinflint (7)" , "Miser in Christmas tale" , "Skinflint Ebenezer" .)