Crossword Genius

Complete National Insurance Contributions to cover time for digital improvement? (8)

Ross

I believe the answer is:

manicure

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'improvement?' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe they are linked in a way 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 manicure that I've seen before include "Work on hand" , "Work on nails" , "Cosmetic treatment for the hands" , "Cosmetic nail treatment" , "Care of hands and fingernails" .)

I've seen this clue in The Independent.
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