The most common and most likely answer to this crossword clue is the 10 letter word ENERGISING
I've seen this crossword clue in The Daily Telegraph
E
N
E
R
G
I
S
I
N
G
More clues leading to the result ENERGISING
Buddy explains!

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 ENERGISING mean?
ENERGISING verb- To invigorate; to make energetic.
- To supply with energy, especially electricity; to turn on power to (something).
- To use strength in action; to act or operate with force or vigor; to act in producing an effect.