By the sound of it, murderer’s brother is competent (4)

I believe the answer is:

able

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

I don't understand the rest of the clue.

(Other definitions for able that I've seen before include "See 10" , "Competent and fit, like sailor" , "Of high proficiency" , "Gifted" , "Skilled" .)

I've seen this clue in The Telegraph.

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