Crossword Genius

A floating hazard in river one tries to pass (8)

Ross

I believe the answer is:

examinee

I'm a little stuck... Click here to teach me more about this clue!

'pass' is the definition.
Both the answer and definition are singular nouns.
Maybe there's a link between them I don't understand?

'a floating hazard in river one tries' is the wordplay.
I cannot quite see how this works, but
'a' is found in the answer.
'in' is within the answer.
'one' could be 'me' (a setter might use 'one' to humourously mean 'me') and 'me' is found within the leftover letters.
'river' could be 'exe' (River Exe) and 'exe' is found within the remaining letters.
No letters remain.
This explanation may well be incorrect...

'to' is the link.

Can you help me to learn more?

(Other definitions for examinee that I've seen before include "Whipped dessert" , "in France, one taking the Baccalaureat?" , "One taking formal test" , "Person who's tested" , "One being tested" .)

I've seen this clue in The Independent.
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