Crossword Genius

Chief (5)

Ross

'chief' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for focal that I've seen before include "Type of length or point" , "sort of length" , "and 21 Across: Centre of attraction" , "Of the point of convergence" , "-- Length, -- plane; -- point" .)

I've seen this clue in The Mirror, the Evening Standard, The Sunday Times and The Times.
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