No longer ready for German philosopher to be announced (5)

I believe the answer is:

marks

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'no longer ready for german philosopher to be announced' is the definition.
I can't judge whether this definition defines the answer.

'philosopher to be announced' is the wordplay.
'philosopher' becomes 'Marx' (Karl Marx).
'to be announced' shows a homophone (sound like).
'marx' is a homophone of 'MARKS'.

Can you help me to learn more?

(Other definitions for marks that I've seen before include "Former German currency" , "Targets" , "See 8" , "Symbols" , "Goals" .)

I've seen this clue in The Independent.

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