Clue: No thanks to naughty Tabitha, that's a vice (3,5)
Answer: BAD HABIT
Explanation: Definition: a vice
At first I thought this was a reverse anagram.
 
(No thanks to Tabitha = (ta)BITHA, which is bad HABIT with bad as an anagrind.)
 
But that left me with "naughty" being superfluous.
 
 So it would appear it is "naughty" = BAD + *(bitha). Clumsy, in my opnion.