6 down
Severe
critic
of
players,
one
fierce
creature
(10)
Severe critic of players, one fierce creature (10)
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The definition is at the beginning of the clue.
How the clue works
The definition is severe critic, and the wordplay builds it up piece by piece: CAST gives you players (as in actors), I is one, and a GATOR is your fierce creature — short for alligator. String them together and there's your answer.