Crossword Genius

The German caller produced a gun (9)

Ross

I believe the answer is:

derringer

'a gun' is the definition.
(I know that Derringer is a type of pistol)

'the german caller' is the wordplay.
'the german' becomes 'der' ('the' in German).
'caller' becomes 'ringer' (someone ringing someone on the phone).
'der'+'ringer'='DERRINGER'

'produced' acts as a link.

(Other definitions for derringer that I've seen before include "Short-barrelled American pistol" , "Weapon" , "Pocket pistol" , "Small pistol used by gamblers in western films" .)

I've seen this clue in The Globe and Mail.
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