Unhappy skinflint with considerable skill (9)

I believe the answer is:

miserable

I'm a little stuck... Click here to teach me more about this clue!

'unhappy' is the definition.
(similar in meaning)

'skinflint with considerable skill' is the wordplay.
'skinflint' becomes 'miser' (synonyms).
'with considerable skill' becomes 'able' (I can't explain this - if you can you should give a lot more credence to this answer).
'miser'+'able'='MISERABLE'

Can you help me to learn more?

(Other definitions for miserable that I've seen before include "Dreary - pathetic" , "Wretched, low" , "Wretched, doleful" , "Being sad" , "sorrowful" .)

I've seen this clue in The Telegraph.

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