The most common and most likely answer to this crossword clue is the 6 plus 6 letter word PEANUT BUTTER
I've seen this crossword clue in The Times
P
E
A
N
U
T
B
U
T
T
E
R
More clues leading to the result PEANUT BUTTER
- Edible spread in exceptionally neat pub, say
- Be about to eat fish up in club's spread
- Spreadable paste a brunette put in a stew
- Spread bun out with tea club sandwiches
- Elvis favourite? A tune played in empty pub, say
- Spread out a tune while in lead, say
- Behind lines a pure net clumsily spread
- Repeat working over two words initially changed from cut and paste
- Spread a brunette put out
- Man holding up carton with fish paste
Buddy explains!

The straight part
We know that "Edible spread" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case edible spread = peanut butter.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.