Crossword Genius

Pike not caught, by the sound of it (4)

Ross

I believe the answer is:

luce

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'pike' is the definition.
(I know that pike can be written as luce)

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 "Fish" , "Pike" .)

I've seen this clue in The Irish Independent.
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