Invent, as a phrase (4)
I believe the answer is:
coin
'invent as a phrase' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for coin that I've seen before include "Invent a word or phrase - for money?" , "little money" , "Metallic money" , "Metal piece of money" , "Invent (a new word)" .)