Choker with brass spike (8)
I believe the answer is:
necklace
'choker' is the definition.
(choker is a type of necklace)
'with brass spike' is the wordplay.
'with' means one lot of letters go next to another.
'brass' becomes 'neck' (I've seen this before).
'spike' becomes 'lace' (synonyms).
'neck' put next to 'lace' is 'NECKLACE'.
(Other definitions for necklace that I've seen before include "Ornamental string" , "Choker perhaps" , "Chain worn as ornament" , "Ornamental chain or cord" , "Throt adornment" .)