The most common and most likely answer to this crossword clue is the 14 letter word PRONUNCIAMENTO
I've seen this crossword clue in The Times
P
R
O
N
U
N
C
I
A
M
E
N
T
O
Buddy explains!
The straight part
We know that "Spanish edict" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case spanish edict = pronunciamento.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 PRONUNCIAMENTO mean?
PRONUNCIAMENTO noun- A manifesto or formal proclamation of rebellion, particularly in Spain, Portugal and Latin America.