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Simple
form
of
life
spotted
in
spiral
galaxy
(4)
Simple form of life spotted in spiral galaxy (4)
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The definition is at the beginning of the clue.
How the clue works
Look at Simple form of life — that's your definition, a basic plant organism. The wordplay has you hunting inside the phrase "spirAL GAlaxy", with spotted in tipping you off that the answer is hiding within those words.