The most common and most likely answer to this crossword clue is the 10 letter word OVERLEAPED
I've seen this crossword clue in Financial Times
O
V
E
R
L
E
A
P
E
D
Buddy explains!

The straight part
We know that "Ignored" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ignored = overleaped.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 OVERLEAPED mean?
OVERLEAPED verb- To leap over, to jump over, to cross by jumping.
- To pass over; to omit, leave out.
- To make too much effort in leaping; to leap too far.