Long raised strip (5)
I believe the answer is:
ridge
'long raised strip' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ridge that I've seen before include "Hog's-back" , "Raised earth between furrows" , "Line of raised ground" , "Long narrow natural elevation" , "German Baltic port, Buxtehude home" .)