Squeak (4)
I believe the answer is:
pipe
'squeak' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for pipe that I've seen before include "'Tube for water or gas, say (4)'" , "Tube, maybe musical" , "Means of conveying" , "Smoker's item" , "Wine cask; sing shrilly" .)