The most common and most likely answer to this crossword clue is the 10 letter word ANGLOPHILE
A
N
G
L
O
P
H
I
L
E
Buddy explains!

The straight part
We know that "England fan" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case england fan = anglophile.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 ANGLOPHILE mean?
ANGLOPHILE noun- A person who loves or admires the country, culture or people of England.