Crossword Genius

Suitability of female, one giving evidence after wife dismissed (7)

Ross

I believe the answer is:

fitness

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'suitability' is the definition.
(fitness is a kind of suitability)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for fitness that I've seen before include "condition" , "Suitability - health" , "State of good health" , "Well-being" , "Competence" .)

I've seen this clue in The Telegraph.
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