Incompetent Dickens character - the end of Oliver? (7)

I believe the answer is:

bumbler

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'incompetent' is the definition.
(I know that bumbler is a type of incompetent)

I cannot understand how the rest of the clue works.

(Other definitions for bumbler that I've seen before include "One who acts awkwardly" , "Confused person" .)

I've seen this clue in The Independent.

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