Crossword Genius

OK for audio (5)

Ross

I believe the answer is:

sound

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

This could be a double definition.

'ok for' is the first definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

'audio' is the second definition.
(synonyms)

Can you help me to learn more?

(Other definitions for sound that I've seen before include "to do the plumbing?" , "Ocean inlet or deep bay" , "Healthy; narrow channel" , "Fit" , "Valid" .)

I've seen this clue in the Evening Standard.
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