Most extensive (7)

I believe the answer is:

largest

'most extensive' is the definition.
('large' can be similar in meaning to 'extensive')

This is the entire clue.

(Other definitions for largest that I've seen before include "Maximum" , "Superlatively extensive" , "Most substantial" , "Biggest" , "Extremely generous" .)

I've seen this clue in the Sydney Morning Herald, the King Feature Syndicate, the Newsday, The Times, the L.A. Times Daily and The Guardian.

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