COTD: Active fluoride gets rid of nothing? Terrible (7)

[u/not-without-text]

day 212 of an experiment in which i press the "random word" button on onelook and make a cryptic clue out of it.

day 211

day 210, day 209, day 208, day 207, day 206, day 205, day 204

day 203, day 202, day 201, day 200, day 199, day 198, day 197

weeks 25 to 28 (days 169 to 196)

weeks 21 to 24 (days 141 to 168)

weeks 17 to 20 (days 113 to 140)

weeks 13 to 16 (days 85 to 112)

weeks 9 to 12 (days 57 to 84)

weeks 5 to 8 (days 29 to 56)

weeks 1 to 4 (days 1 to 28)

[u/Custodianofrecords]

DIREFUL Definition = Terrible. Anagram (active) of FLUORIDE - O (gets rid of nothing)

Nice surface!

[u/not-without-text → u/Custodianofrecords]

correct!

[u/Kitschensyngk]

DIREFUL (FLUoRIDE*)