A possibly expensive publication! (5)

I believe the answer is:

libel

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

'publication' is the definition.
(I have seen 'Defamatory publication ' mean 'libel' so perhaps 'publication' could also mean 'libel')

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for libel that I've seen before include "Slanderous statements in print" , "Crime of publishing false statement that damages reputation" , "Report bad things" , "Calumnious writing" , "Offence" .)

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