The most common and most likely answer to this crossword clue is the 5 letter word ARRAY
A
R
R
A
Y
More clues leading to the result ARRAY
- Marshal calm when changing side repeatedly
- Draw up fair treaty, leaving odd parts out
- Display of top-grade river fish
- Aussie river rising in impressive display
- Northbound Melbourne river formation
- Order, one devoured by Cockney
- Display 26 across fish
- Order a queen to skate
- Impressive display of American river fish
- Display a river fish
Buddy explains!

The straight part
We know that "Impressive display" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case impressive display = array.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 ARRAY mean?
ARRAY noun- Clothing and ornamentation.
- A collection laid out to be viewed in full.
- An orderly series, arrangement or sequence.
- Order; a regular and imposing arrangement; disposition in regular lines; hence, order of battle.
- A large collection.
- Common name for matrix.
- Any of various data structures designed to hold multiple elements of the same type; especially, a data structure that holds these elements in adjacent memory locations so that they may be retrieved using numeric indices.
- A ranking or setting forth in order, by the proper officer, of a jury as impanelled in a cause; the panel itself; or the whole body of jurors summoned to attend the court.
- A militia.
- A group of hedgehogs.
- A microarray.
- To clothe and ornament; to adorn or attire.
- To lay out in an orderly arrangement; to deploy or marshal.
- To set in order, as a jury, for the trial of a cause; that is, to call them one at a time.