Certificates of a financial description (5)

I believe the answer is:

scrip

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'certificates of a financial description' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'of a financial description' is the wordplay.
'of' indicates a hidden word.
'SCRIP' is hidden within 'financial description'.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.

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