Crossword Genius

Directory of wannabe knights scared to fight? (6,5)

Ross

I believe the answer is:

yellow pages

'directory' is the definition.
(phone directory)

I don't understand how the rest of the clue works.

(Other definitions for yellow pages that I've seen before include "looking for service here?" , "Directory" , "Reference book for business numbers" , "Telephone reference book" .)

I've seen this clue in The Guardian.
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