Obstacle to soldiers encourages uproar (8)

I believe the answer is:

eggshell

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'obstacle to soldiers' is the definition.
I can't judge whether this definition defines the answer.

'encourages uproar' is the wordplay.
'encourages' becomes 'eggs'.
'uproar' becomes 'hell' (I've seen this before).
'eggs'+'hell'='EGGSHELL'

Can you help me to learn more?

(Other definitions for eggshell that I've seen before include "Variety of paint" , "that soldiers have to get through" , "Thin (porcelain); shiny (paint)" , "protective covering?" , "Paint that dries with a sheen" .)

I've seen this clue in The Independent.

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