2 down
Starry
Parisian
is
one
active
in
political
group
(9)
Starry Parisian is one active in political group (9)
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The definition is at the beginning of the clue.
How the clue works
Starry is the definition here. Take CELL (a political group), and slip inside it EST (how a Parisian says "is" in French), I (one) and A (the first letter of "active"), landing between the CEL and the final L of CELL to give CELESTIAL.