Until such time as an official ClockworkMod recovery is available, I have created an interim (non official) ClockworkMod Touch release. Please note that the One X doesn't seem to enable access to USB when booted as recovery (proven by flashing the recovery partition with the insecure boot), so you will not be able to use ADB etc. at this time.
INSTALL AND USE AT YOUR OWN RISK!
Your bootloader must be unlocked via htcdev.com to install this.
To use, either flash via fastboot ('fastboot flash recovery r1-modaco-recovery-clockwork-touch-endeavoru.img') or boot directly ('fastboot boot r1-modaco-recovery-clockwork-touch-endeavoru.img').
MOD EDIT: warning!!! old recovery with charging issues and NO USB Mount use latest recovery from here or TWRP
I have also uploaded the stock recovery should you wish to flash it (e.g. for OTA).
PS If you find this useful, details on how to donate should you wish to do so are available in the MoDaCo topic.