For example, "reprimand son for being so unfeeling" is scold -- a synonym of reprimand, and then s for son and cold for unfeeling.
I enjoy doing the cryptic crossword in our local paper. Unfortunately, the ones in national papers are too hard for me. Often the trick is knowing something like that a sailor used to be called a "tar".
They are a lot of fun though; I prefer them to general knowledge since all you need to answer them is time, lateral thinking and a good vocabulary. They are also a great illustration of the workings of the subconscious -- coming back to a puzzle after a short time usually yields some answers instantly.
As introduction, here's one that's good and towards the easier end of the cryptic scale: http://www.guardian.co.uk/crosswords/cryptic/25247. There's a solution (with explanations) at http://fifteensquared.net/2011/02/16/guardian-25247-enigmati...
It's celebrating a crossword-setter's 90th birthday, and most of the in-jokes are explained in comments.
http://www.wired.com/magazine/2010/12/frank-w-lewis-wwii-cod...
Here are the rules for his cryptics:
http://www.thenation.com/crossword
For instance,
"I have seen such teasers as the clue BUR to suggest the phrase RUB THE WRONG WAY."
In the print edition of the magazine, the advice at the bottom of the puzzle used to be:
"If you are unsure why 'lures' are 'ground rules', send for ours at (address of the magazine)." So clever.
Here's a sample of each : http://crosswordclub.timesonline.co.uk/crossword/print?type=... , http://crosswordclub.timesonline.co.uk/crossword/print?type=...
There's definitely a ranking amongst the papers too.
My favourtie cryptic crossword clue: "HIJKLMNO"
Answer: "Water"