The most common and most likely answer to this crossword clue is the 8 letter word HONORARY
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More clues leading to the result HONORARY
Buddy explains!

The straight part
We know that "V/oluntary fee" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case v/oluntary fee = honorary.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 HONORARY mean?
HONORARY noun- An honorarium; a fee for services of no fixed value.
- A kind of secret society that operates in name only, with membership given to honor some achievement.
- Given as an honor/honour, with no duties attached, and without payment.
- Voluntary.
- Describes the holder of a position or title that is assigned to him as a special honor rather than by normal channels.