Crossword Genius

Catheter (4)

Ross

I believe the answer is:

tube

'catheter' is the definition.
(thesaurus)

This is the entire clue.

(Other definitions for tube that I've seen before include "Pipe or hose" , "Valve" , "Pipe - railway" , "Can of beer (colloquial)" , "Hollow body for the underground" .)

I've seen this clue in the Sydney Morning Herald.
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