Hurry up! It's needed to correct a figure (4-2)

I believe the answer is:

roll-on

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'hurry' is the definition.
Both the answer and definition are singular nouns.
Perhaps there's a link between them I don't understand?

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

Can you help me to learn more?

(Other definitions for roll-on that I've seen before include "Deodorant or cosmetic" , "Type of deodorant" .)

I've seen this clue in the Evening Standard.

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