Lapel ornament (3)
I believe the answer is:
pin
'lapel ornament' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pin that I've seen before include "Small object to fasten or attach" , "Fixing device" , "Badge" , "Skittle; fix" , "Fasten; a security code" .)