The most common and most likely answer to this crossword clue is the 10 letter word REMARKABLE
I've seen this crossword clue in Financial Times
R
E
M
A
R
K
A
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E
More clues leading to the result REMARKABLE
- Striking, like schoolwork submitted a second time?
- Strange about a king turning into stone
- Can be checked again by teacher? It’s important
- Signal can be assessed once more
- Amazing statement supported by expert
- A rebel converted having absorbed gospel? Extraordinary
- Homework that’s been submitted again is so amazing
- Spectacular band on ship with talented following
- Noteworthy as script from borderline candidate might be?
- Possible to revise test score? That’s conspicuous
Buddy explains!

The straight part
We know that "Can be checked again by teacher/It’s important" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case can be checked again by teacher/it’s important = remarkable.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 REMARKABLE mean?
REMARKABLE adjective- Worthy of being remarked or noted; notable
- Uncommon; unusual