Crossword Genius

Urine not analysed for tiny particle (8)

Ross

I believe the answer is:

neutrino

'tiny particle' is the definition.
(type of subatomic particle)

'urine not analysed' is the wordplay.
'analysed' indicates anagramming the letters.
'urine'+'not'='urinenot'
'urinenot' with letters rearranged gives 'NEUTRINO'.

'for' is the link.

(Other definitions for neutrino that I've seen before include "Subatomic particle, now said to travel faster than light" , "Minute item lacking mass" , "Tiny thing not charged" , "Spinner" , "Small piece of matter" .)

I've seen this clue in The Guardian.
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