29 across
What
dogs
do,
pleased
to
see
bird
(7)
What dogs do, pleased to see bird (7)
hints
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The definition is at the end of the clue.
How the clue works
The definition is bird — specifically a WAGTAIL, that little thing you see bobbing about on pavements. Picture a dog greeting you: "what dogs do" gives you WAG, and "pleased to see" conjures up the TAIL they're wagging, and you just put the two together.