Crossword Genius

Hamper from ex-students with one who skipped school about to replace case from Amazon (8)

Ross

I believe the answer is:

obstruct

'hamper' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for obstruct that I've seen before include "Impede - block" , "Get in the way of" , "Block the passage or shut out the view" , "Hinder or impede" , "Stymie" .)

I've seen this clue in The Independent.
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