The most common and most likely answer to this crossword clue is the 7 letter word FABRICS
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More clues leading to the result FABRICS
Buddy explains!

The straight part
We know that "See these embroidering briefcases" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case see these embroidering briefcases = fabrics.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 FABRICS mean?
FABRICS noun- An edifice or building.
- The act of constructing, construction, fabrication.
- The structure of anything, the manner in which the parts of a thing are united; workmanship, texture, make.
- The framework underlying a structure.
- A material made of fibers, a textile or cloth.
- The appearance of crystalline grains in a rock.
- Interconnected nodes that look like a textile fabric when diagrammed.