Staggering to undergo extreme deprivation - poor child (6)

I believe the answer is:

urchin

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'poor child' is the definition.
(urchins are poor children)

I cannot understand how the remainder of the clue works.

(Other definitions for urchin that I've seen before include "kid on street" , "Waif" , "grubby kid" , "Ragged child or sea creature with round shell" , "Sea creature or mischievous child" .)

I've seen this clue in The Independent.

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