Crossword Genius

First principles (9)

Ross

I believe the answer is:

rudiments

'first principles' is the definition.
('rudiment' can be a synonym of 'first principle')

This is all the clue.

(Other definitions for rudiments that I've seen before include "basic principles" , "Basics of any subject" .)

I've seen this clue in the Evening Standard and the Sydney Morning Herald.
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