Vacuum cleaner (6)
I believe the answer is:
hoover
'vacuum cleaner' is the definition.
(I know that vacuum cleaner can be written as hoover)
This is all the clue.
(Other definitions for hoover that I've seen before include "Former president of US and vacuum cleaner" , "Vacuum-cleaner" , "J Edgar . . . . . . was FBI chief" , "J Edgar ...... was FBI boss." , "Type of 5 down" .)