Changing round an abode of pigs is unpleasant (5)

I believe the answer is:

nasty

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'is unpleasant' is the definition.
(synonyms)

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

(Other definitions for nasty that I've seen before include "Evil" , "Highly unpleasant" , "Disagreeable" , "One who sees the future" , "Beastly" .)

I've seen this clue in The Globe and Mail.

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