The most common and most likely answer to this crossword clue is the 8 letter word DEADENED
D
E
A
D
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D
Buddy explains!
The straight part
We know that "Became numb" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case became numb = deadened.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 DEADENED mean?
DEADENED verb- To render less lively; to diminish; to muffle.
- To become less lively; to diminish (by itself).
- To make soundproof.