Elaborate couturier back in glowing form (9)
I believe the answer is:
embroider
'elaborate' is the definition.
(I've seen this before)
'couturier back in glowing form' is the wordplay.
'couturier' becomes 'Dior' (Christian Dior, luxury fashion house).
'back' says the letters should be written in reverse.
'in' means one lot of letters goes inside another.
'glowing form' becomes 'ember' (I can't justify this - if you can you should give a lot more credence to this answer).
'dior' back-to-front is 'roid'.
'roid' put inside 'ember' is 'EMBROIDER'.
Can you help me to learn more?
(Other definitions for embroider that I've seen before include "Exaggerate" , "stitch" , "Sew decoration onto" , "Sew; embellish" , "Dress up" .)