Furrow or channel (6)
I believe the answer is:
groove
This clue is a double definition.
'furrow' is the first definition.
(I know that furrow can be written as groove)
'channel' is the second definition.
(I know that channel can be written as groove)
(Other definitions for groove that I've seen before include "Long shallow depression or routine" , "Long narrow channel in surface of hard material" , "'Channel, furrow (6)'" , "Spiral track followed by a gramophone needle" , "Cutting" .)