Make Scottish banks money (4)
I believe the answer is:
dosh
'money' is the definition.
(slang term)
'make scottish banks' is the wordplay.
'make' becomes 'do' (do can mean to make or prepare).
'banks' means to remove the middle letters (the sides or banks of the word).
'scottish' with its centre removed is 'sh'.
'do'+'sh'='DOSH'
(Other definitions for dosh that I've seen before include "Money (slang)" , "Bread - gravy - dough" , "Money (sl.)" , "Lolly (slang)" , "Ready" .)