The most common and most likely answer to this crossword clue is the 10 letter word IMPORTANCE
I've seen this crossword clue in Financial Times
I
M
P
O
R
T
A
N
C
E
More clues leading to the result IMPORTANCE
- Bring in acne treatment of significance
- Ship in champion holding national significance
- Top Crimean flip-flopping power
- I am left with euphoria ultimately — it’s nice when one’s lost weight
- Note that is about 40% of Mancunians consuming fortified wine
- Tip Cameron somehow to get power
- Note Spinner's opening with an empty clue
- Politician protected by abnormal reaction to gravity
Buddy explains!

The straight part
We know that "power" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case power = importance.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 IMPORTANCE mean?
IMPORTANCE noun- The quality or condition of being important or worthy of note.
- Significance or prominence.
- Personal status or standing.
- Something of importance.