15 down
Cat
still
gripping
tail
of
dog,
another
cat
upset
about
that
(6,3)
Cat still gripping tail of dog, another cat upset about that (6,3)
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The definition is at the beginning of the clue.
How the clue works
The Cat here is a GINGER TOM. Take INERT for "still" and have it grip G, the tail of "dog", giving INGERT. Then MOG, another word for cat, is "upset" (reversed) to GOM and placed around that, delivering GINGER TOM.