Hurry up! It's needed to correct a figure (4-2)
I believe the answer is:
roll-on
'hurry' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I don't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for roll-on that I've seen before include "Deodorant or cosmetic" , "Type of deodorant" .)