10 across
Possible
sickener,
incomplete
story
of
environmentalism?
(1,4)
Possible sickener, incomplete story of environmentalism? (1,4)
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The definition is at the beginning of the clue.
How the clue works
The Possible sickener here is E COLI, the bacterium that can make you ill. Building it up, ECO stands for environmentalism, and "story" gives LIE, made incomplete by dropping its final letter to leave LI. Put ECO and LI together and you get the answer.