Snug necklace (6)
I believe the answer is:
choker
'snug necklace' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for choker that I've seen before include "Tight necklet - sportsman that wilts under pressure" , "Tight necklace, collar" , "Close-fitting necklace" , "Band worn around the neck" , "Close-fitting band round neck" .)