The most common and most likely answer to this crossword clue is the 12 letter word SUBSCRIPTION
I've seen this crossword clue in The Daily Telegraph
S
U
B
S
C
R
I
P
T
I
O
N
Buddy explains!
The straight part
We know that "fee" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fee = subscription.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 SUBSCRIPTION mean?
SUBSCRIPTION noun- Access to a resource for a period of time, generally for payment.
- The formal acceptance of something, especially when verified with a signature.
- The signing of one's name.