Accessory, old remnant remade (8)
I believe the answer is:
ornament
'accessory' is the definition.
(I've seen this before)
'old remnant remade' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'remade' indicates anagramming the letters.
'remnant' is an anagram of 'rnament'.
'o'+'rnament'='ORNAMENT'
(Other definitions for ornament that I've seen before include "Trim" , "small decorative object" , "Decorative item" , "Decoration, adornment" , "to dress up" .)