Get on one's nerves (6)
I believe the answer is:
rankle
'get on one's nerves' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rankle that I've seen before include "get up your nose" , "Cause continuous irritation" , "Go on irritating" , "Cause ill-feeling" , "will continue to cause irritation" .)