Fit; competent (4)

I believe the answer is:

able

I believe this clue is a double definition.

'fit' is the first definition.
(similar in meaning)

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

(Other definitions for able that I've seen before include "Adept" , "Having great proficiency or intelligence" , "Competent as seaman may be" , "Practised" , "Having the necessary capacity (to do something)" .)

I've seen this clue in The Telegraph.

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