A disgusted expression (3)

I believe the answer is:

ugh

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'expression' is the definition.
(I have seen 'Expression of disgust' mean 'ugh' so perhaps 'expression' could also mean 'ugh')

I can't explain the rest of the clue.

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(Other definitions for ugh that I've seen before include "Kind of hug - it's disgusting" , "Expression of disgust" , "Exclamation of disgust, at 22 ac say" , "That's disgusting!" , "Yuck (colloq.)" .)

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

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