Spike attached to brass choker, say (8)
I believe the answer is:
necklace
'choker say' is the definition.
(I know that choker is a type of necklace)
'spike attached to brass' is the wordplay.
'spike' becomes 'lace' (synonyms).
'attached to' is a charade indicator (letters next to each other).
'brass' becomes 'neck' (I've seen this in other clues).
'lace' put after 'neck' is 'NECKLACE'.
(Other definitions for necklace that I've seen before include "One may get stoned!" , "Decorative chain" , "Chain worn as ornament" , "Eg, a choker" , "Choker perhaps" .)