Quick-firing naval anti-aircraft gun used in both World Wars (3-3)

I believe the answer is:

pom-pom

(Other definitions for pom-pom that I've seen before include "Woollen clothing ornament" , "Anti-aircraft cannon - woolly ball" , "Woollen ball" , "Type of dahlia with tightly clustered petals" , "Tightly-clustered flower; garment decoration" .)

I've seen this clue in The Guardian.

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