Really grate on (4)
I believe the answer is:
rile
(Other definitions for rile that I've seen before include "'Vex, irritate (4)'" , "Exasperate" , "Stir up anger" , "Irk" , "Annoy, nettle" .)
I believe the answer is:
rile
(Other definitions for rile that I've seen before include "'Vex, irritate (4)'" , "Exasperate" , "Stir up anger" , "Irk" , "Annoy, nettle" .)