Wretched competent to be remediable (7)

I believe the answer is:

curable

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'be remediable' is the definition.
(thesaurus)

'wretched competent' is the wordplay.
'wretched' becomes 'cur' (I can't justify this - if you can you should give a lot more credence to this answer).
'competent' becomes 'able' (similar in meaning).
'cur'+'able'='CURABLE'

'to' is the link.

Can you help me to learn more?

(Other definitions for curable that I've seen before include "Able to be made healthy" , "suitable for smoking?" , "Responsive to treatment" .)

I've seen this clue in the Sydney Morning Herald.

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