Crossword Genius

Union in fun dismissing leader (8)

Ross

I believe the answer is:

alliance

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

'union' is the definition.
(I know that alliance is a type of coalition)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for alliance that I've seen before include "Formal agreement" , "Confederation" , "Group acting together for common cause" , "Wanting marriage" , "League - treaty" .)

I've seen this clue in The Guardian.
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