The most common and most likely answer to this crossword clue is the 10 letter word FORECASTER
I've seen this crossword clue in The Times
F
O
R
E
C
A
S
T
E
R
More clues leading to the result FORECASTER
- Mining output about to be brought in more quickly, I predict
- One predicting fantastic twists penned by novelist
- Met man working in foster care?
- For festival around end of Dec, one must look ahead
- Person predicting improved foster care
- One who predicts changing foster care
- Coming out of foster care, one tells of what is to come
Buddy explains!

The straight part
We know that "One predicting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one predicting = forecaster.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 FORECASTER mean?
FORECASTER noun- A person who forecasts.
- A software program or algorithm that forecasts.