If you are jailbroken you can use a tweak called AppLocker or Lockdown Pro.
Another tweak called 36MobileSafe claims to lock individual apps too, but I have never used it.
AppLocker and MultiCleaner will not work together. Endless safe mode loop after the first respring after installing.
Because I must have MultiCleaner, I use Lockdown Pro..,,which works "almost" perfectly.
Why "almost"?
Because if you lock the Mail.app, you can still open it via Notification Center what IntelliScreenX is installed. Other than that it is far better then AppLocker.