Competent, fit (4)

I believe the answer is:

able

This clue is a double definition.

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

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

(Other definitions for able that I've seen before include "Competent and equipped" , "Gifted" , "Having the necessary capacity (to do something)" , "See 10" , "Having considerable skill" .)

I've seen this clue in The Irish Times.

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