Crossword Genius

Reference work (12)

Ross

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12

13

encyclopaedia

'reference work' is the definition.
(encyclopaedia is a kind of reference work)

This is the entire clue.

(Other definitions for encyclopaedia that I've seen before include "Extensive reference work" , "Book covering whole range of knowledge" , "Reference book on branches of knowledge" , "Large book of general knowledge" , "source of information" .)

I've seen this clue in The Independent and The Telegraph.
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