The most common and most likely answer to this crossword clue is the 9 letter word BLAZONING
I've seen this crossword clue in Independent
B
L
A
Z
O
N
I
N
G
Buddy explains!
The straight part
We know that "Heralding" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case heralding = blazoning.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 BLAZONING mean?
BLAZONING verb- To describe a coat of arms.
- To make widely or generally known, to proclaim.
- To display conspicuously or publicly.
- To shine; to be conspicuous.
- To deck; to embellish; to adorn.
- The action of the verb to blazon; the activity of describing heraldic coats of arms.