Urine not flowing? It should pass right through you! (8)

I believe the answer is:

neutrino

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'it should pass right through you' is the definition.
The definition suggests a singular noun which matches the answer.

'urine not flowing?' is the wordplay.
'flowing?' indicates an anagram.
'urine'+'not'='urinenot'
'urinenot' anagrammed gives 'NEUTRINO'.

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(Other definitions for neutrino that I've seen before include "There's almost nothing to it!" , "Subatomic particle, now said to travel faster than light" , "Minute item lacking mass" , "Uncharged elementary particle" , "This barely affects anything" .)

I've seen this clue in The Irish Times.

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