Crossword Genius

Fish not yet caught, one hears (4)

Ross

I believe the answer is:

luce

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

'fish' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for luce that I've seen before include "Pike" , "Fish" .)

I've seen this clue in The Irish News.
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