Something like a submarine or a cigar (5)

I believe the answer is:

kazoo

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'cigar' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for kazoo that I've seen before include "Simple musical instrument" , "Humming toy" , "Toy-like instrument into which one hums" , "Toy wind instrument that buzzes" .)

I've seen this clue in the Evening Standard.

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