The most common and most likely answer to this crossword clue is the 10 letter word LONG-RANGE
I've seen this crossword clue in Financial Times
L
O
N
G
-
R
A
N
G
E
More clues leading to the result LONG-RANGE
- Left on farm describing some forecasts
- Left running country house over quite some time
- Learner on farm looking to the future
- Learner on farm referring to a weather forecast maybe
- Farmhouse needing 50% of capital upfront, extending into the future
- Able to reach remote targets, only securing relative gain initially
- Looking ahead, sees lake on farm
- Student on farm is going far
Buddy explains!

The straight part
We know that "over quite some time" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case over quite some time = long-range.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 LONG-RANGE mean?
LONG-RANGE adjective- Operating, or capable of operating, over a great distance.
- Involving a great period of time.