Sort of peninsula (4)
I believe the answer is:
cape
'sort of peninsula' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cape that I've seen before include "Headland - garment" , "Cloak, robe" , "Outer garment" , "Sleeveless garment like a cloak" , "Head; garment" .)