9 across
Bird
in
Greek
river
(6)
Bird in Greek river (6)
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The definition is at the beginning of the clue.
How the clue works
Right, so Bird down there is your definition — the grouse, the moorland game bird. For the wordplay, take GR, the usual abbreviation for Greek, and stick it in front of OUSE, a well-known English river, and you've got your answer.