Q-tip, for one (4)
I believe the answer is:
swab
'q-tip for one' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for swab that I've seen before include "Cotton wool mop" , "Pad used in surgery" , "Piece of fabric for medical use" , "Among others, Q-tip" , "Absorbent pad for cleansing or drying" .)