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

The straight part
We know that "US haberdashery/ ideas" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case us haberdashery/ ideas = notions.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 NOTIONS mean?
NOTIONS noun- Mental apprehension of whatever may be known, thought, or imagined; idea, concept.
- A sentiment; an opinion.
- Sense; mind.
- An invention; an ingenious device; a knickknack.
- Any small article used in sewing and haberdashery, either for attachment to garments or as a tool, such as a button, zipper, or thimble.
- Inclination; intention; disposition.