Shrew lifting bottom, tricky when tail removed earlier (8)

I believe the answer is:

harridan

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'shrew' is the definition.
(harridan is a kind of shrew)

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

(Other definitions for harridan that I've seen before include "Nagging old woman" , "Battleaxe" , "and badger sounding out, Sir" , "Nagger" , "Shrewish old woman" .)

I've seen this clue in The Guardian.

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