The term 'ABSTAINER's Frequency' is a phrase used to describe the frequency with which an ABSTAINER, or someone who refrains from certain activities, practices their abstinence. The crossword solution for this term is 'NEVER', indicating that an ABSTAINER's frequency is always at zero. This phrase is often used in the context of addiction recovery, as it is important for those in recovery to practice abstinence from their addictive behaviors on a regular basis.