Get into hot water? Crossword Clue

 The answer to the crossword clue "Get into hot water?" can be TROUBLE.

This is because the phrase "get into hot water" means to get into trouble. The word "trouble" can also mean "hot water", so the clue is a pun.

Here are some other possible answers to the clue:

Trouble

Difficulty

Misfortune

Danger

Peril

Jeopardy

The specific answer that is correct will depend on the context of the crossword puzzle.