Wretched penny-pincher is competent (9)
I believe the answer is:
miserable
'wretched' is the definition.
(I know that wretched can be written as miserable)
'penny-pincher is competent' is the wordplay.
'penny-pincher' becomes 'miser' (I've seen this before).
'is competent' becomes 'able' (similar in meaning).
'miser'+'able'='MISERABLE'
(Other definitions for miserable that I've seen before include "sorrowful" , "Dreary - pathetic" , "Blue" , "Wretched, doleful" , "Depressed" .)