From Nike etc., fancy clothing accessory (7)
I believe the answer is:
necktie
'accessory' is the definition.
(I know that necktie is a type of neckwear)
'from nike etc' is the wordplay.
'from' is an anagram indicator (the anagram comes from the same letters).
'nike'+'etc'='nikeetc'
'nikeetc' anagrammed gives 'NECKTIE'.
'fancy clothing' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for necktie that I've seen before include "Long narrow piece of material worn knotted at the front" , "one can get knotted" , "Item worn round collar (mainly US)" , "Ascot?" , "Item of (American) clothing" .)