The most common and most likely answer to this crossword clue is the 7 letter word EARLDOM
E
A
R
L
D
O
M
More clues leading to the result EARLDOM
- Aristo's position in cracking melodrama uncovered
- A lord, me? What might that become for me?
- Fashion model assuming a Republican title
- Listener originally lambasting sixties youth over title
- Attention brought to monk on line in Essex?
- What may come with making me a lord
- Me, a Lord, excited in peer's estate
- Title or medal for wrestling
- Am older, bursting to succeed to this?
- A model unexpectedly receiving right noble rank
Buddy explains!

The straight part
We know that "Land of some 30" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case land of some 30 = earldom.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 EARLDOM mean?
EARLDOM noun- The rank of being an earl.
- The territory controlled by an earl.