The most common and most likely answer to this crossword clue is the 7 letter word QUAILED
I've seen this crossword clue in The Guardian
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More clues leading to the result QUAILED
Buddy explains!

The straight part
We know that "cowered" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cowered = quailed.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 QUAILED mean?
QUAILED verb- To waste away; to fade, to wither
- To daunt or frighten (someone)
- To lose heart or courage; to be daunted or fearful.
- Of courage, faith, etc.: to slacken, to give way.
- To curdle or coagulate, as milk does.