Crossword Genius

Invent what uranium and phosphorus do in combination (4,2)

Ross

I believe the answer is:

make up

Here is my best explanation:

'invent' is the definition.

('make up' can be a synonym of 'invent')

I cannot understand how the rest of the clue works.

This clue was last seen in The Independent

(Other definitions for make up that I've seen before include "Compensate", "Bury the hatchet", "war paint?", "Compose - cosmetics", "Slap", "Invent", "bury the hatchet", "become friends again", "type of paint" and "slap".)

Ross

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