Hindrance alumni deal with, not Keble's first (8)

I believe the answer is:

obstacle

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'hindrance' is the definition.
(I know that obstacle is a type of hindrance)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for obstacle that I've seen before include "Maybe let" , "Anything that stands in the way" , "Thing that obstructs progress" , "Stab Cleo (anag) - which hinders progress" , "difficulty" .)

I've seen this clue in The Times.

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