Crossword Genius

Five-day trials? (5)

Ross

I believe the answer is:

tests

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'trials?' is the definition.
(I know this)

I don't understand the remainder of the clue.

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(Other definitions for tests that I've seen before include "Tries out" , "Major cricket matches" , "Examinations, trials" , "Trials to see if something works" , "Trials, exams" .)

I've seen this clue in the Evening Standard.
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