On paper, the stock issue (5)

I believe the answer is:

scrip

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'on paper' is the definition.
'scrip' can be an answer for 'paper' (thesaurus). I'm not certain of the 'on' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for scrip that I've seen before include "Preliminary shares certificate" , "bag" , "Certificates of investments earning dividends" , "Share certificate" , "extra shares" .)

I've seen this clue in the Evening Standard.

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