The most common and most likely answer to this crossword clue is the 9 letter word CAVALCADE
I've seen this crossword clue in The Daily Telegraph
C
A
V
A
L
C
A
D
E
More clues leading to the result CAVALCADE
- Procession of a woman and nasty fellow in church
- Moving show about rebel on throne returning
- Sparkling wine, liberally laced in Coward play
- Sparkling drink left by young recruit short of time in procession
- After a drink, student trainee misses end of procession
- A bounder grabbing girlin church procession
- Sparkling wine left by trainee short of time in procession
Buddy explains!

The straight part
We know that "procession" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case procession = cavalcade.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 CAVALCADE mean?
CAVALCADE noun- (collective) A company of riders.
- A parade.
- A trail ride, usually more than one day long.
- (by extension) A series, a chain (e.g. of events).
- To move as part of a series or group, such as marchers in a parade or snow in an avalanche, especially in large numbers or in a chaotic or dangerous fashion