Twin Brits in Oz, at least have a gun (3-3)

I believe the answer is:

pom-pom

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(Other definitions for pom-pom that I've seen before include "Tightly-clustered flower; garment decoration" , "Decorative tuft on shoes etc." , "Form of dahlia" , "Cheerleader's ball of material" , "Decorative tuft or ball - mop up twice" .)

I've seen this clue in the Evening Standard.

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