The most common and most likely answer to this crossword clue is the 4 letter word JADE
J
A
D
E
More clues leading to the result JADE
- A DJ playing English rock
- Ornamental stone jars dear with fifty percent off
- Jack plug taken by English hack
- Hack ornamental stone
- Green exhaust
- Ornamental stone jardiniere initially manufactured, first off
- Hack stone
- First person in France to exhibit commercial gemstone
- Trailer in outskirts of jungle — and old horse
- Stone horse not in prime condition
Buddy explains!

The straight part
We know that "rock" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rock = jade.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 JADE mean?
JADE noun- A semiprecious stone, either nephrite or jadeite, generally green or white in color, often used for carving figurines.
- A bright shade of slightly bluish or greyish green, typical of polished jade stones.
- A succulent plant, Crassula ovata.
- Of a grayish shade of green, typical of jade stones.
- A horse too old to be put to work.
- A bad-tempered or disreputable woman.
- To tire, weary or fatigue
- To treat like a jade; to spurn.
- To make ridiculous and contemptible.