The most common and most likely answer to this crossword clue is the 7 letter word UNTAXED
I've seen this crossword clue in The Times
U
N
T
A
X
E
D
More clues leading to the result UNTAXED
Buddy explains!
The straight part
We know that "free of charge" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case free of charge = untaxed.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 UNTAXED mean?
UNTAXED adjective- Not subject to being taxed.
- Not having had the required taxes paid on it.
- Not tired or strained, working well within capacity.