Lab sterilizer (9)
I believe the answer is:
autoclave
'lab sterilizer' is the definition.
(I know that lab sterilizer can be written as autoclave)
This is all the clue.
(Other definitions for autoclave that I've seen before include "In which you'd get boiling hot" , "Vessel for, eg, steam sterilisation" , "Surgical instruments steriliser" .)