The most common and most likely answer to this crossword clue is the 5 letter word PARCH
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More clues leading to the result PARCH
Buddy explains!

The straight part
We know that "dry out" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dry out = parch.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PARCH mean?
PARCH noun- The condition of being parched.
- To burn the surface of, to scorch.
- To roast, as dry grain.
- To dry to extremity; to shrivel with heat.
- To make thirsty.
- To boil something slowly (Still used in Lancashire in parched peas, a type of mushy peas).
- To become superficially burnt; be become sunburned.