Miser keeping pile in curious casket (10)
I believe the answer is:
cheapskate
'miser' is the definition.
(cheapskate is a kind of miser)
'pile in curious casket' is the wordplay.
'pile' becomes 'heap' ('heap' can be a synonym of 'pile').
'in' is an insertion indicator.
'curious' indicates an anagram.
'casket' anagrammed gives 'cskate'.
'heap' put into 'cskate' is 'CHEAPSKATE'.
'keeping' is the link.
(Other definitions for cheapskate that I've seen before include "ungenerous person" , "Ungenerous type" , "he won't pay the going rate" , "Scrooge" , "Miserly type" .)