Crossword Genius

The mother of invention, it's said (9)

Ross

I believe the answer is:

necessity

(Other definitions for necessity that I've seen before include "It's said to be the mother of invention" , "Something essential or indispensable" , "Great need" , "Need, exigency" , "Requirement" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.
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