The most common and most likely answer to this crossword clue is the 10 letter word DEDICATORY
I've seen this crossword clue in The Guardian
D
E
D
I
C
A
T
O
R
Y
More clues leading to the result DEDICATORY
Buddy explains!

The straight part
We know that "Commemorative/Commemorative" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case commemorative/commemorative = dedicatory.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.