Lacking the skill in New Labour to dismiss row (6)

I believe the answer is:

unable

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'lacking the skill' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for unable that I've seen before include "Not having the necessary means or skill or know-how" , "Incapable" , "Incompetent or powerless" , "Lacking the skill" , "Nebula (anag)" .)

I've seen this clue in The Irish Times.

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