The most common and most likely answer to this crossword clue is the 15 letter word ELECTROPOSITIVE
I've seen this crossword clue in Independent
E
L
E
C
T
R
O
P
O
S
I
T
I
V
E
Buddy explains!
The straight part
We know that "kind of charge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case kind of charge = electropositive.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 ELECTROPOSITIVE mean?
ELECTROPOSITIVE noun- A body which passes to the negative pole in electrolysis.
- Having a positive electric charge
- Tending to release electrons to form a chemical bond