Grin's "ends" (4)
I believe the answer is:
ears
(Other definitions for ears that I've seen before include "'''Friends, Romans, countrymen, lend me your ...'' (Julius Caesar) (4)'" , "Lugs (colloq.)" , "Organs for 7 down" , "''He who has ... to hear, let him hear'' (bible)" , "Listening organs" .)