Crossword Genius

Suitable trial for Darwin's survivors (7)

Ross

I believe the answer is:

fittest

'darwin's survivors' is the definition.
(Charles Darwin, survival of the fittest)

'suitable trial' is the wordplay.
'suitable' becomes 'fit' (similar in meaning).
'trial' becomes 'test' (synonyms).
'fit'+'test'='FITTEST'

'for' acts as a link.

(Other definitions for fittest that I've seen before include "'Survival of the - - '" , "superlatively healthy" , "Most suitable" , "most sound" , "Healthiest" .)

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