The most common and most likely answer to this crossword clue is the 6 letter word TROPIC
I've seen this crossword clue in Financial Times
T
R
O
P
I
C
More clues leading to the result TROPIC
- Turning a hundred, I left line on map
- Left revolutionary in charge of hot line?
- Some latitude is right in subject-matter
- Theme involves recipe for a certain degree of latitude?
- King is absorbed by subject’s global line
- Imaginary circle subject holds right
- Subject is suppressing resistance ring
- King is absorbed by subject of terrestrial boundary
- Latitude given by king, subject admits
- One of two lines read initially, in matter for discussion
Buddy explains!
The straight part
We know that "terrestrial boundary" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case terrestrial boundary = tropic.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.