Crossword Genius

Most costly (7)

Ross

I believe the answer is:

dearest

'most costly' is the definition.
('dear' can be a synonym of 'costly')

This is the entire clue.

(Other definitions for dearest that I've seen before include "Most expensive or beloved" , "Affectionate address" , "Most loved or expensive" , "Loved one" , "most excessive" .)

I've seen this clue in The Guardian and the L.A. Times Daily.
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