term:

Saving Clause

saving clause n

: a clause in a statute exempting something from the statute's operation or providing that the rest of it will stand if part is held invalid
;also
: a contractual clause providing that if part of the contract is invalidated the rest shall remain in effect called also savings clause

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.