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Later course supporter of African party, say, picked up after British left (10)

Ross

I believe the answer is:

blancmange

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'later course' is the definition.
(type of dessert)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for blancmange that I've seen before include "group?" , "Pudding made with milk - ABC man, Glen (anag)" , "Dessert of flavoured milk stiffened with cornflower" , "Mouldy food" , "Wobbly dessert" .)

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