Appropriate rhyme for “stash” Crossword Clue

 The appropriate rhyme for “stash” in a crossword clue is CACHE.

Cache is a hidden store of something, especially something valuable. It can also refer to a computer's memory that is used to store frequently accessed data.

Stash is a hidden store of money or other valuables. It can also refer to a hidden supply of something, such as food or weapons.

The two words rhyme because they have the same vowel sounds and consonant sounds at the end of the word.

I hope this helps! Let me know if you have any other questions.