Sword-shaped sateen creation (6)
I believe the answer is:
ensate
'sword-shaped' is the definition.
(I've seen this before)
'sateen creation' is the wordplay.
'creation' is an anagram indicator.
'sateen' with letters rearranged gives 'ENSATE'.
(Other definitions for ensate that I've seen before include "It's shaped like a sword" , "Like some leaves" , "sword-shaped" , "Like a blade" .)