What is the crossword answer for the clue: No longer operative

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

ISTANBUL - a 8 letter word may be the answer you are looking for!

FLAT - a 4 letter word may be the answer you are looking for!

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

No longer operative

4 Character Answers:

FLAT

7 Character Answers:

DEFUNCT

IMMENSE

8 Character Answers:

ISTANBUL