What is the crossword answer for the clue: Tough problem

NOT - a 3 letter word may be the answer you are looking for!

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

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

AHARDPEANUTTOCRACK - a 18 letter word may be the answer you are looking for!

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

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

Tough problem

3 Character Answers:

NOT

4 Character Answers:

KNOT

5 Character Answers:

POSER

7 Character Answers:

DILEMMA

STINKER

18 Character Answers:

AHARDPEANUTTOCRACK