Soldiers shouldn't find it hard to stand thus (4)

I believe the answer is:

easy

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'thus' is the definition.
Both the definition and answer are adverbs. Maybe they are linked in a way I don't understand?

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

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(Other definitions for easy that I've seen before include "Promiscuous" , "Posing no difficulty" , "Achieved without effort" , "Simply achieved" , "Simple or uncomplicated" .)

I've seen this clue in The Irish News.

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