Skinflint's endless woe (5)
I believe the answer is:
miser
'skinflint's' is the definition.
(synonyms)
'endless woe' is the wordplay.
'endless' means to remove the last letter.
'woe' becomes 'misery' (I've seen this in another clue).
'misery' with its final letter taken off is 'MISER'.
(Other definitions for miser that I've seen before include "One hoarding money" , "Avaricious hoarder" , "Penny-pinching person like Scrooge" , "Wealth hoarder" , "Cheapskate" .)