Crossword Genius

Luhrmann took many seconds, subsuming sound of big gun (7)

Ross

I believe the answer is:

bazooka

I'm a little stuck... Click here to teach me more about this clue!

'big gun' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

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

I've seen this clue in the Sydney Morning Herald.
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