Crossword Genius

A leading publication? (5)

Ross

I believe the answer is:

guide

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'a leading' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'publication?' is the second definition.
(I know that guide is a type of enchiridion)

Can you help me to learn more?

(Other definitions for guide that I've seen before include "Navigate" , "Usher" , "Pilot" , "directory" , "conductor" .)

I've seen this clue in The Globe and Mail, The Irish News and The Telegraph.
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