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Einstein
retrospectively
taking
legal
action
over
equation’s
origin
(6)
Einstein retrospectively taking legal action over equation’s origin (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Einstein — he's the archetypal one, isn't he. Now, take SUING (taking legal action) and drop in E (the first letter of "equation" — that's your "origin") to get SUINEG, then flip the whole thing around (retrospectively) and there's your answer.