Scrooge, perhaps keeping large amount in rough casket (10)
I believe the answer is:
cheapskate
'scrooge' is the definition.
(cheapskate is a kind of scrooge)
'keeping large amount in rough casket' is the wordplay.
'keeping' indicates putting letters inside.
'large amount' becomes 'heap'.
'in rough' indicates an anagram (I've seen this in other clues).
'casket' anagrammed gives 'cskate'.
'heap' placed inside 'cskate' is 'CHEAPSKATE'.
'perhaps' acts as a link.
(Other definitions for cheapskate that I've seen before include "he won't pay the going rate" , "Scrooge" , "Ungenerous type" , "Tightwad" , "Miserly person" .)