The most common and most likely answer to this crossword clue is the 10 letter word CONGESTION
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More clues leading to the result CONGESTION
Buddy explains!

The straight part
We know that "Capital charge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case capital charge = congestion.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 CONGESTION mean?
CONGESTION noun- The hindrance or blockage of the passage of something, for example a fluid, mixture, traffic, people, etc. (due to an excess of this or due to a partial or complete obstruction), resulting in overfilling or overcrowding.
- An excess or accumulation of something