Crossword Genius

Worry, needing chapter for book? That's a bummer (6)

Ross

I believe the answer is:

cadger

'that's a bummer' is the definition.
(thesaurus)

I don't understand the rest of the clue.

(Other definitions for cadger that I've seen before include "Sponger" , "Scrounger, moocher" , "One who scrounges and begs" , "Graced (anag)" , "Scrounger seeking help" .)

I've seen this clue in The Independent.
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