Beat this for a political slogan (8)

I believe the answer is:

belabour

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'beat' is the definition.
(I know this)

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

(Other definitions for belabour that I've seen before include "discuss at length" , "Beat" , "thrash" , "Attack physically or verbally" , "Harangue" .)

I've seen this clue in The Globe and Mail.

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