The most common and most likely answer to this crossword clue is the 8 letter word MEMORIAL
I've seen this crossword clue in The Times
M
E
M
O
R
I
A
L
More clues leading to the result MEMORIAL
- The writer with message in story about one monument?
- Note heartless opponent finding monument?
- Commemorative dinner, say, to entertain poll organisers
- Foreign currency note found on top of the Cenotaph?
- Statue of Rommel I rebuilt around Alexandria, initially
- Record note on UAE currency
- Intend to take in historic city, climbing large monument
- Record fifty with intent to tour capital on way back
- Reminder one’s given in passing
- Note: Gulf money used to build a monument
Buddy explains!

The straight part
We know that "Commemorative" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case commemorative = memorial.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 MEMORIAL mean?
MEMORIAL noun- Memory; recollection.
- Something, such as a monument, by which someone or something is remembered.
- A chronicle or memoir.
- A note or memorandum.
- A service of remembrance or commemoration.
- A statement of facts set out in the form of a petition to a person in authority, a court or tribunal, a government, etc.
- Serving as a remembrance of someone or something; commemorative.
- Contained in the memory.
- Mnemonic; assisting the memory.