Large bra served up in purple (4)

I believe the answer is:

puce

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'purple' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for puce that I've seen before include "Dark red or purple-brown colour" , "Brownish-purple colour" , "Purplish-brown colour" , "Shade" , "Purplish colour" .)

I've seen this clue in The Guardian.

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