The most common and most likely answer to this crossword clue is the 10 letter word COMMANDING
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More clues leading to the result COMMANDING
Buddy explains!

The straight part
We know that "Leading" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case leading = commanding.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 COMMANDING mean?
COMMANDING verb- To order, give orders; to compel or direct with authority.
- To have or exercise supreme power, control or authority over, especially military; to have under direction or control.
- To require with authority; to demand, order, enjoin.
- To dominate through ability, resources, position etc.; to overlook.
- To exact, compel or secure by influence; to deserve, claim.
- To hold, to control the use of.
- To have a view, as from a superior position.
- To direct to come; to bestow.
- The act of giving a command.
- Tending to give commands, authoritarian.
- Impressively dominant.
- (of a place or position) Dominating from above, giving a wide view