The most common and most likely answer to this crossword clue is the 7 letter word RIP-OFF
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The straight part
We know that "Overcharge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case overcharge = rip-off.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 RIP-OFF mean?
RIP-OFF noun- A bad deal; an unfair or exorbitant price or rate.
- A theft or robbery.
- A scam.
- A copy, especially one that is illegal or inferior.