The most common and most likely answer to this crossword clue is the 8 letter word SILENCED
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More clues leading to the result SILENCED
Buddy explains!

The straight part
We know that "suppressed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case suppressed = silenced.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 SILENCED mean?
SILENCED verb- To make (someone or something) silent.
- To repress the expression of something.
- To suppress criticism, etc.
- To block gene expression.
- Murder
- Made silent
- (of a firearm) fitted with a silencer