Anti-tank weapon named after a musical instrument popularised in the 1930s by radio comedian Bob Burns (7)

I believe the answer is:

bazooka

(Other definitions for bazooka that I've seen before include "Portable rocket launcher" , "Anti-tank rocket launcher - trumpet-shaped kazoo" , "Portable anti-tank weapon" , "Anti-tank gun" , "A portable rocket-launcher" .)

I've seen this clue in The Independent.

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