Work for Schubert perhaps making multiple copies (4-10)

I believe the answer is:

mass-production

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

'making multiple copies' is the definition.
(I've seen this before)

'work for schubert perhaps' is the wordplay.
I cannot really understand how this works, but
'work' could be 'product' (I've seen this before) and 'product' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for mass-production that I've seen is " Manufacturing practice".)

I've seen this clue in The Independent.

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