The most common and most likely answer to this crossword clue is the 8 letter word ULTERIOR
I've seen this crossword clue in Financial Times
U
L
T
E
R
I
O
R
More clues leading to the result ULTERIOR
- Uranium ore lit unusual reactor below the surface
- Extremely unusual rogue having a change of character in the future
- Son quits province with one other missing article hidden
- Rail route diverted to avoid Austria? It’s not immediately apparent
- Defaulter, I organised housing beyond a certain point
- Corrupt trio rule in the future
- United let injured Ferdinand recuperate initially in secret
- Beyond rule with riot spreading
- Covert sect without leader sounds increasingly strange
- Remoter area dropped from new rail route
Buddy explains!
The straight part
We know that "hidden" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hidden = ulterior.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 ULTERIOR mean?
ULTERIOR adjective- Situated beyond, or on the farther side.
- Beyond what is obvious or evident.
- Being intentionally concealed so as to deceive.
- Happening later; subsequent.