C.O.D.
A type of fish brought by the mailman

Coat of Arms
Monster’s coat with 13 sleeves

Cocoon
A wound up caterpillar

Coincide
The sensible thing to do when it’s raining

Cold Front
What you’ve got when you stand with your back to the fireplace.

Cold War
A snowball fight.

Colonial:
Pertaining to the large intestine. – Joseph Leff

Colonist:
A believer in sentence-interrupting punctuation. – Joseph Leff

Colour Guard:
Sentry at the paint facotry. – Joseph Leff

Coloured Cravat:
Tie-dyed. – Joseph Leff

Combination:
Only one comb in a country. – Joseph Leff

Comedian
A person who knows a good gag when he steals one.

Comedian:
A shared highway divider. – Joseph Leff

Comet:
Jointly encountered. – Joseph Leff

Comic Surgeon:
A real cut up. – Joseph Leff

Commandant:
Give orders to an insect. – Joseph Leff

Commend:
Fix a website. – Joseph Leff

Commentator
A talking spud

Commission:
An on-line church organisation. – Joseph Leff

Committee
A body that keeps minutes and wastes hours

Commodore:
Bathroom entrance. – Joseph Leff

Communion:
An on-line labour organisation. – Joseph Leff

Compete:
Let’s go, Peter. – Joseph Leff

Completed Jigsaw Puzzle:
A pieceful solution. – Joseph Leff

Compulsive Golfer:
A crackputt. – Joseph Leff

Concave:
Where swindlers hide. – Joseph Leff

Conceit
(1) I-strain
(2) Chair near a ship’s steering wheel.  
(3) An incurable “I” disease. – Joseph Leff