Crossword Genius

Official report of headless chicken in container (8)

Ross

I believe the answer is:

bulletin

This clue might be a double definition.

'official report' is the first definition.
(a news report)

'headless chicken in container' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'of' acts as a link.

(Other definitions for bulletin that I've seen before include "Newsflash" , "Official statement for publication" , "Regular news up-date" , "Newsletter, report" , "Short and regular up-date" .)

I've seen this clue in The Guardian.
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