Hint with an alternative definition: the sense used to perceive sound with ears-holes and a hall of the scull, if you have this tool (like a sluice of hearing) you know who is laughing or saying «Hoo!» and you are able to hear a whole soundscape – from a low sough of wind or pulse to loud howls of a wolf.

Hint with transformations: to look > to slookh (to see by ears)

Russian tip: свойство уха ловить эхо, след от звука и понимать слова (хулу или хвалу)

Mental visualization: C (ear) + Л (notes) + У (tuning fork) + X (sound information)