Crossword Genius

It's wrong to hiss at our continental friends (5)

Ross

I believe the answer is:

amiss

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'it's wrong' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

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(Other definitions for amiss that I've seen before include "astray" , "Mistaken" , "inappropriately" , "Wrongly" , "In an inappropriate way" .)

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