Fragrant neckwear (3)
I believe the answer is:
'fragrant neckwear' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lei that I've seen before include "Band of flowers" , "Necklace of tropical flowers" , "Hawaiian wreath" , "Floral decoration" , "Flowers worn round the neck" .)