Crossword Genius

Rock legend's first principle (8)

Ross

I believe the answer is:

keystone

'principle' is the definition.
(thesaurus)

'rock legend's first' is the wordplay.
'rock' becomes 'stone' (synonyms).
'legend' becomes 'key' (legend can mean a key on a map or diagram).
'first' is a charade indicator (letters next to each other).
'stone' after 'key' is 'KEYSTONE'.

(Other definitions for keystone that I've seen before include "Piece at the top of a masonry arch" , "Chief element" , "What tops an arch" , "everything may depend on it" , "Vital support" .)

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