OK, I'd start the whole thing by explaining what the Canard Enchaîné is. Obvioulsy, that would include an explanation of the canard=duck in French as newspaper=rag in English. For this section, I'd explain as follows:

Section Title: CANARDAGES

A play on the word BAVARDAGES, which means chatter. The word canard (duck) replaces bavard. All of the newspaper's section headings are puns about ducks.

--------------------------------------------------
Note added at 49 mins (2012-12-12 17:26:47 GMT)
--------------------------------------------------

Ah yes - just realised it's not necessarily a play on bavardages but on the verb "canarder" i.e. to take pot shots.

Section: Sitting Ducks (or Section: Sitting Ducks of the week)

"canarder ✰ [kanaʀde] (se conjugue comme arriver)
1 verbe transitif
[au fusil] ▶ to snipe at, ▶ to take potshots at "
[Collin-Robert]

You can see it as section where they are taking "satirical potshots" at all sort of people who deserved it.

To keep with the imagery of ducks, all these miscreants could be seen as "sitting ducks" - people who put themselves in a position where they are exposed in plain view to "satirical potshots".

"sitting duck

Fig. someone or something vulnerable to attack, physical or verbal. (Alludes to a duck floating on the water, not suspecting that it is the object of a hunter or predator. *Typically: be ~; like ~; looking like~.) You look like a sitting duck out there. Get in here where the enemy cannot fire at you. The senator was a sitting duck because of his unpopular position on school reform."
[http://idioms.thefreedictionary.com/sitting duck]