Janitor's tool
I believe the answer is:
mop
'janitor's tool' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for mop that I've seen before include "Hair, unkempt" , "Clean; mass of hair" , "Bundle of soft material at end of stick for cleaning" , "A thick mass of hair on head" , "Swab" .)