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German girl has a job churning out copies of The Mirror (10)

Ross

I believe the answer is:

glassworks

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

'churning out copies of the mirror' is the definition.
I can't tell whether this defines the answer.

'german girl has a job' is the wordplay.
'german' becomes 'g' (abbreviation).
'girl' becomes 'lass' (lass is a kind of girl).
'has a job' becomes 'works' (I've seen this before).
'g'+'lass'+'works'='GLASSWORKS'

Can you help me to learn more?

(Other definitions for glassworks that I've seen before include "Factory making lights" , "some of whose output may be cut?" , "Manufacturer of, eg, windows" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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