Swab (3)
I believe the answer is:
mop
'swab' is the definition.
(I know that mop is a is a kind of of swab)
This is all the clue.
(Other definitions for mop that I've seen before include "A thick mass of hair on head" , "It's used to wipe the floor" , "Floor wiper" , "Tangle of hair" , "Wet cleaner" .)