Crossword Genius

Go on to become environmental activist (4)

Ross

I believe the answer is:

gore

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

'go on' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?

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

Can you help me to learn more?

(Other definitions for gore that I've seen before include "piece of material" , "Impale" , "stuff from part of Kensington" , "Result of bleeding" , "Pierce with horn - blood" .)

I've seen this clue in The Sun.
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