Crossword Genius

Skilled listener: fish in one's ear? (5)

Ross

I believe the answer is:

tuner

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

'skilled listener' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'fish in one's ear?' is the wordplay.
'fish' becomes 'tuna' (tuna is a type of fish).
'in one's ear?' indicates a 'sounds like' (homophone) clue.
'tuna' sounds like 'TUNER'.

Can you help me to learn more?

(Other definitions for tuner that I've seen before include "Piano adjuster" , "Adjuster of pianos" , "piano man?" , "Motor specialist" , "Radio adjuster" .)

I've seen this clue in The Guardian.
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