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Hamburger, say, one that infects a number (6)

Ross

I believe the answer is:

german

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'hamburger' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'one that infects a number' is the wordplay.
'one that infects' becomes 'germ' (I can't explain this - if you can you should give a lot more credence to this answer).
'number' becomes 'n' (n can represent any number).
'germ'+'a'+'n'='GERMAN'

'say' acts as a link.

Can you help me to learn more?

(Other definitions for german that I've seen before include "Manger (anag.)" , "European language" , "This national rang me up" , "Teutonic language" , "Helmut?" .)

I've seen this clue in The Guardian.
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