Skirt panel (4)
I believe the answer is:
gore
'skirt panel' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for gore that I've seen before include "Clotted blood" , "stuff from part of Kensington" , "Bloodshed" , "piece of material" , "Blood on a piece let into a garment?" .)