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... and poultry, we hear -- shameful! (4)

Ross

I believe the answer is:

foul

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'shameful' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for foul that I've seen before include "Filthy" , "Offensive; polluted" , "Offensive to the senses" , "Offensive, abominable" , "Violation of a sporting rule" .)

I've seen this clue in The Telegraph.
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