The most common and most likely answer to this crossword clue is the 8 letter word THRUMMED
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The straight part
We know that "sounded thus" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sounded thus = thrummed.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 THRUMMED mean?
THRUMMED verb- To cause a steady rhythmic vibration, usually by plucking.
- To make a monotonous drumming noise.
- To furnish with thrums; to insert tufts in; to fringe.
- To insert short pieces of rope-yarn or spun yarn in.
- Made with thrums (leftover warp thread) woven into the fabric.