Fashion-obsessed Ivor parading somewhat revolutionary outfits (8)
I believe the answer is:
provided
'parading somewhat revolutionary outfits' is the definition.
I can't tell whether this definition defines the answer.
'fashion-obsessed ivor' is the wordplay.
I cannot quite see how this works, but
an anagram of 'ivor' is 'rovi' which is within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for provided that I've seen before include "... on understanding that" , "If - supplied" , "in the event" , "Given" , "furnished" .)