The most common and most likely answer to this crossword clue is the 7 letter word AFFIXED
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The straight part
We know that "Set" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case set = affixed.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 AFFIXED mean?
AFFIXED verb- To attach.
- To subjoin, annex, or add at the close or end; to append to.
- To fix or fasten figuratively; with on or upon.
- Enduringly stuck to, or attached to, something.
- With an affix.