Crossword Genius

Ultimately a happy one? (6)

Ross

I believe the answer is:

ending

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ending that I've seen before include "Close - conclusion" , "Terminating" , "Final part" , "Last part" , "Climax" .)

I've seen this clue in the Evening Standard.
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