Crossword Genius

This is sung for joy (4)

Ross

I believe the answer is:

glee

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for glee that I've seen before include "much fun" , "Unholy delight" , "(Malicious) satisfaction" , "Lively or triumphant joy" , "Great merriment" .)

I've seen this clue in The Irish Independent.
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