The most common and most likely answer to this crossword clue is the 9 letter word PANOPLIES
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Buddy explains!
The straight part
We know that "impressive collections" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case impressive collections = panoplies.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 PANOPLIES mean?
PANOPLIES noun- A splendid display of something.
- (by extension) A collection or display of weaponry.
- Ceremonial garments, complete with all accessories.
- A complete set of armour.
- (by extension) Something that covers and protects.
- (by extension) A broad or full range or complete set.