Weirdly morbid, eery decoration (10)
I believe the answer is:
embroidery
'decoration' is the definition.
(thesaurus)
'weirdly morbid eery' is the wordplay.
'weirdly' indicates anagramming the letters.
'morbid'+'eery'='morbideery'
'morbideery' anagrammed gives 'EMBROIDERY'.
(Other definitions for embroidery that I've seen before include "Creative sewing" , "The art of sewing patterns" , "Decorative needlework" .)