Necklace component (4)
I believe the answer is:
bead
'necklace component' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bead that I've seen before include "Small ornamental strung ball" , "Necklace piece; droplet" , "Small round piece of glass" , "Drop, part of rosary" , "A bit of the rosary" .)