Crossword Genius

What we hear is good (5)

Ross

I believe the answer is:

sound

I'm a little stuck... Click here to teach me more about this clue!

'is good' is the definition.
(similar in meaning)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sound that I've seen before include "place for sailing, perhaps" , "Not diseased or damaged - listen" , "Valid" , "Speaking" , "Healthy; narrow channel" .)

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app