Extremes of earth-shattering philosophy from Husserl, a noble sort? (4)

I believe the answer is:

earl

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'noble sort?' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

(Other definitions for earl that I've seen before include "Real kind of English lord" , "Peer of the realm" , "Lear (anag)" , "Titled man" , "Real (anag) - nobleman" .)

I've seen this clue in The Irish Times.

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