Perhaps Vivienne Westwood suit oddly gender fluid (8)
I believe the answer is:
designer
'perhaps vivienne westwood' is the definition.
I can't tell whether this definition defines the answer.
'suit oddly gender fluid' is the wordplay.
'oddly' indicates alternate letters (letters in odd-numbered positions).
'fluid' indicates anagramming the letters.
The alternate letters of 'suit' are 'si'.
'si'+'gender'='sigender'
'sigender' with letters rearranged gives 'DESIGNER'.
Can you help me to learn more?
(Other definitions for designer that I've seen before include "Custom-made" , "inventor" , "One who determines the look of something" , "Originator" , "Planner; draughtsman" .)