Incompetent worthy (7)

I believe the answer is:

notable

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'incompetent worthy' is the definition.
'notable' can be an answer for 'worthy' (I've seen this before). I'm unsure of the 'incompetent' bit.

'incompetent worthy' is the wordplay.
'incompetent' becomes 'not' (I can't explain this - if you can you should believe this answer much more).
'worthy' becomes 'able' (I've seen this in another clue).
'not'+'able'='NOTABLE'

Can you help me to learn more?

(Other definitions for notable that I've seen before include "Prominent" , "Famous or memorable" , "Celebrated" , "well known" , "Impressive" .)

I've seen this clue in The Irish Independent.

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