Crossword Genius

* Philosopher took Spinoza on about conclusions (4)

Ross

I believe the answer is:

edge

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'philosopher' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

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

Can you help me to learn more?

(Other definitions for edge that I've seen before include "Guitarist with U2" , "Margin, outside limit" , "Move slowly" , "Upper hand" , "Line where soething begins or ends" .)

I've seen this clue in the Sydney Morning Herald.
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