The most common and most likely answer to this crossword clue is the 7 letter word SHUNNED
I've seen this crossword clue in The Guardian
S
H
U
N
N
E
D
More clues leading to the result SHUNNED
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 = shunned.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 SHUNNED mean?
SHUNNED verb- To avoid, especially persistently.
- To escape (a threatening evil, an unwelcome task etc).
- To screen, hide.
- To shove, push.