The most common and most likely answer to this crossword clue is the 5 plus 5 letter word TERRA FIRMA
I've seen this crossword clue in Financial Times
T
E
R
R
A
F
I
R
M
A
More clues leading to the result TERRA FIRMA
- Land in tree: am picked up after major alarm sounded
- At start of Monza, Ferrari made up ground
- Sound of a monster more securely fixed in solid ground
- Land about right, a farmer needing it cultivated
- Solid earth company put in ground at rear
- Land and fit rear arm anew
- Land with extreme fear more established, as some might say
- Mainland bishop coming in to tea bringing company to Iona at last
- With little hesitation, artist leading company among soldiers going to earth?
- Land volunteers admitting blunder before wood starts to mature again
Buddy explains!
The straight part
We know that "solid ground" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case solid ground = terra firma.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.