Pre-tied tie (4-2)
I believe the answer is:
clip-on
'pre-tied tie' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for clip-on that I've seen before include "Kind or earring or bow tie" , "Gripping accessory" , "Attached like a bow tie, for example" , "Kind of earring or brooch?" , "Like some ties" .)