Clear the decks? (4)
I believe the answer is:
swab
'clear the decks?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for swab that I've seen before include "Mop up - uncouth fellow" , "Piece of fabric for medical use" , "Hospital cleaner" , "Absorbent pad for cleansing or drying" , "Specimen" .)