Removing vice from China perhaps is a hard problem (6)

I believe the answer is:

teaser

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'problem' is the definition.
(I've seen this before)

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

(Other definitions for teaser that I've seen before include "Puzzling question or gentle goader" , "Conundrum" , "Difficult problem concerning Easter" , "one using a backcomb" , "Difficult question" .)

I've seen this clue in The Telegraph.

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