One constantly talking German when appropriate (6)

I believe the answer is:

gasbag

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'one constantly talking' is the definition.
I can't judge whether this defines the answer.

'german when appropriate' is the wordplay.
'german' becomes 'g' (abbreviation).
'when' becomes 'as'.
'appropriate' becomes 'bag' (I am not sure about this - if you are sure you should believe this answer much more).
'g'+'as'+'bag'='GASBAG'

Can you help me to learn more?

(Other definitions for gasbag that I've seen before include "I can't shut up" , "One who natters a lot" , "A compulsive talker with balloon?" , "Chatterbox" , "I talk too much" .)

I've seen this clue in The Independent.

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