And turned, somehow, over (9)

I believe the answer is:

redundant

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'over' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

'and turned somehow' is the wordplay.
'somehow' indicates anagramming the letters.
'and'+'turned'='andturned'
'andturned' with letters rearranged gives 'REDUNDANT'.

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(Other definitions for redundant that I've seen before include "No longer necessary" , "No longer useful" , "unwanted" , "on the scrap heap?" , "excessive?" .)

I've seen this clue in the Evening Standard.

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