Crossword Genius

Journo's back in capital before end of evening, producing copy (8)

Ross

I believe the answer is:

doubling

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'copy' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'journo's back in capital before end of evening' is the wordplay.
'back' says to take the final letters.
'in' is an insertion indicator.
'capital' becomes 'dublin' (Dublin is an example**).
'before' means one lot of letters go next to another.
'end of' suggests the final letters.
The last letter of 'journo' is 'o'.
The last letter of 'evening' is 'g'.
'o' inserted inside 'dublin' is 'doublin'.
'doublin'+'g'='DOUBLING'

'producing' is the link.

Can you help me to learn more?

(Other definitions for doubling that I've seen before include "Increasing twofold" , "Increasing by a factor of two" .)

I've seen this clue in The Telegraph.
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