Crossword Genius

Battle without end to save revolutionary work in sport (5,4)


I believe the answer is:

water polo

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'sport' is the definition.
(I know that water polo is a type of athletic game)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for water polo that I've seen before include "Sport for swimmers" , "event" , "Game played by tams of swimmers with large ball (5.4)" , "Swimming pool game" , "Seven-a-side game involving swimming" .)

I've seen this clue in The Times.
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