Dress up in hot material receiving backing of designer (9)
I believe the answer is:
embroider
'dress up' is the definition.
(thesaurus)
'hot material receiving backing of designer' is the wordplay.
'hot material' becomes 'ember' (I can't explain this - if you can you should believe this answer much more).
'receiving' is an insertion indicator.
'backing of' is a reversal indicator.
'designer' becomes 'dior' (dior is a designer brand).
'dior' written backwards gives 'roid'.
'ember' enclosing 'roid' is 'EMBROIDER'.
'in' is the link.
Can you help me to learn more?
(Other definitions for embroider that I've seen before include "Sew decoration onto" , "Sew; embellish" , "Dress up" , "stitch" , "Ornament with needlework" .)