Crossword Genius

Philosopher’s nadir: redundant, in retreat, diminished (7)

Ross

I believe the answer is:

derrida

'philosopher's' is the definition.
(Jacques Derrida, 1930-2004)

'nadir redundant in retreat diminished' is the wordplay.
'diminished' indicates the answer is hidden within the clue (a smaller amount of the letters).
'in retreat' shows that the letters should be reversed in order.
'adirred' is hidden in the letters of 'nadir redundant'.
'adirred' back-to-front is 'DERRIDA'.

(Another definition for derrida that I've seen is " Philosopher".)

I've seen this clue in The Times.
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