Miser to hide stone (9)
I believe the answer is:
skinflint
'miser' is the definition.
(synonyms)
'hide stone' is the wordplay.
'hide' becomes 'skin' (a hide is an animal skin).
'stone' becomes 'flint' (I've seen this before).
'skin'+'flint'='SKINFLINT'
'to' acts as a link.
(Other definitions for skinflint that I've seen before include "Very ungenerous or stingy person" , "21 [MISER]" , "A miserly person like Scrooge" , "Scrooge, miser" , "A mean, miserly person" .)