The most common and most likely answer to this crossword clue is the 6 letter word BASALT
I've seen this crossword clue in The Guardian
B
A
S
A
L
T
More clues leading to the result BASALT
- Rock made of barium and sodium chloride
- . A sailor after the first edition of Brighton Rock
- Atlas absolutely flipped carrying rock
- Rock band’s first American season
- Graduate with wit finds pottery
- Type of pottery made by graduate and seaman
- Rock has one sailor landing upside down on another
- Estonian, say, collects a singular 25
- Airline condiment – it’s volcanic
- Barium compound in rock from 2
Buddy explains!
The straight part
We know that "25" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 25 = basalt.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 BASALT mean?
BASALT noun- A hard mafic igneous rock of varied mineral content; volcanic in origin, which makes up much of the Earth's oceanic crust.
- A type of unglazed pottery.