The most common and most likely answer to this crossword clue is the 8 letter word PRESERVE
I've seen this crossword clue in The Times
P
R
E
S
E
R
V
E
More clues leading to the result PRESERVE
- Keep page at front of book
- Can Trump ultimately hold back?
- Speciality marmalade
- Keep last of the sheep on the Serengeti, say
- Can perhaps shoot game here?
- In advance, dish out jam
- Keep quiet over book
- Not wriggling clear of porters, even in a pickle or jam?
- Uphold Pasternak’s first book
- Maintain power and propriety of manner
Buddy explains!

The straight part
We know that "Speciality/marmalade" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case speciality/marmalade = preserve.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 PRESERVE mean?
PRESERVE noun- A sweet spread made of any of a variety of fruits.
- A reservation, a nature preserve.
- An activity with restricted access.
- To protect; to keep from harm or injury.
- To save from decay by the use of some preservative substance, such as sugar or salt; to season and prepare (fruits, meat, etc.) for storage.
- To maintain throughout; to keep intact.