Grind your teeth (5)
I believe the answer is:
gnash
(Other definitions for gnash that I've seen before include "grinding action" , "grate" , "Grind one's teeth" , "Hangs (anag.)" , "Grind away" .)
I believe the answer is:
gnash
(Other definitions for gnash that I've seen before include "grinding action" , "grate" , "Grind one's teeth" , "Hangs (anag.)" , "Grind away" .)