The most common and most likely answer to this crossword clue is the 7 letter word HYDRATE
H
Y
D
R
A
T
E
More clues leading to the result HYDRATE
- Doctor’s alter ego trapping rodent in compound
- Cover broadcast on charge to supply water
- Slow up, being restricted by explosive chemical
- Supply liquid, beating dry heat
- Hard yet malleable? Add water
- The Yard’s tipsy soak
- Water grass in London park
- Water-containing chemical he has injected behind, going up!
- Compound's hard, yet fractured
- Terribly dry, detest to go outside compound
Buddy explains!

The straight part
We know that "Compound" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case compound = hydrate.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 HYDRATE mean?
HYDRATE noun- A solid compound containing or linked to water molecules.
- Water.
- To take up, consume or become linked to water.
- To drink water.
- To load data from a database record into an object's variables