Master copy rearranged for clients (7)

I believe the answer is:

stencil

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

'master copy' is the definition.
'stencil' can be an answer for 'copy' (I've seen this before). I'm unsure of the 'master' bit.

'rearranged for clients' is the wordplay.
'clients' anagrams to 'STENCIL'.
Though, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for stencil that I've seen before include "Create design" , "Clients (anag)" , "means of decoration" , "Copy" , "Perforated sheet for producing patterns or symbols" .)

I've seen this clue in The Irish News.

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