In order to install Xcode 4.3.2 with Command Line Tools you have to register your Apple ID as a Developer (in that link you can create an Apple ID if you don’t have one).
After getting that done, open the App Store and search for “xcode” then click install. You will be asked to sign in (if you are not already).
Once the installation is done, open Xcode (you can hit Command + Space to open Spotlight and type “xcode”), click Xcode > Preferences > Downloads and you will see the option to install the “Command Line Tools” at the very end, click it and you are done!