The most common and most likely answer to this crossword clue is the 6 plus 8 letter word EPICAL (PLAICE)
E
P
I
C
A
L
(
P
L
A
I
C
E
)
Buddy explains!
The straight part
We know that "on an impressive scale" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case on an impressive scale = epical (plaice).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.