Uncover extremes of in-fighting hidden by party (3,2)

I believe the answer is:

dig up

'uncover' is the definition.
(I know that uncover can be written as dig up)

I cannot understand how the rest of the clue works.

(Other definitions for dig up that I've seen before include "Uncover (something hidden)" , "Unearth" , "Disinter" , "Find" , "Exhume" .)

I've seen this clue in The Independent.

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