Subject of certain theories, complicated yet trivial (10)
I believe the answer is:
relativity
'subject of certain theories' is the definition.
(as in Einstein's two theories of relativity)
'complicated yet trivial' is the wordplay.
'complicated' indicates anagramming the letters.
'yet'+'trivial'='yettrivial'
'yettrivial' with letters rearranged gives 'RELATIVITY'.
(Another definition for relativity that I've seen is " scientific principle".)
I've seen this clue in The Times.
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