21 down
Kill
little
dog
upset
when
redecorating
(5,2)
Kill little dog upset when redecorating (5,2)
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The definition is at the end of the clue.
How the clue works
The definition is when redecorating — that's your DOING UP meaning renovating. "Kill" gives you DO IN, then "little dog" is PUG, which gets reversed ("upset") to give GUP, and when you run them together you get DOIN + GUP = DOING UP.