Crossword Genius

Advocate, for example, game that must undergo revolution (4)

Ross

I believe the answer is:

urge

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'advocate for' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for urge that I've seen before include "Plead" , "Incite to action" , "Press (persistently)" , "Encourage to proceed, drive onwards" , "Sudden desire" .)

I've seen this clue in The Telegraph.
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