The most common and most likely answer to this crossword clue is the 10 letter word CONSERVING
I've seen this crossword clue in The Daily Telegraph
C
O
N
S
E
R
V
I
N
G
Buddy explains!

The straight part
We know that "Saving" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case saving = conserving.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.
Crossword Answer definitions
CONSERVING verb- To save for later use, sometimes by the use of a preservative.
- To protect an environment.
- To remain unchanged during a process
- Accompanied by conservation.