What is the crossword answer for the clue: Doesnt work

FAILS - a 5 letter word may be the answer you are looking for!

IDLES - a 5 letter word may be the answer you are looking for!

LOAFS - a 5 letter word may be the answer you are looking for!

RESTS - a 5 letter word may be the answer you are looking for!

ISNTOK - a 6 letter word may be the answer you are looking for!

CLASHES - a 7 letter word may be the answer you are looking for!

Doesn't work

5 Character Answers:

FAILS

IDLES

LOAFS

RESTS

6 Character Answers:

ISNTOK

7 Character Answers:

CLASHES