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Prising the lid off troublesome Aussie's beer cooler (4)

Ross

I believe the answer is:

esky

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for esky that I've seen before include "Portable drinks chiller (Australian)" , "Aussie container" , "It may help to keep cool" , "Cooler" .)

I've seen this clue in The Telegraph.
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