The most common and most likely answer to this crossword clue is the 7 letter word ZEALOUS
I've seen this crossword clue in The Guardian
Z
E
A
L
O
U
S
More clues leading to the result ZEALOUS
- Keen character at the end showing envy after Judge departs
- Enthusiastic call for getting rid of extremists into God
- Very keen to have a look into god
- Militant god takes a look inside
- To Zulu, a louse may be full of enthusiasm
- Keenjudge leaves as last character’s taken on
- Very enthusiastic Greek god gets a look in
- Eager or wary? Source of joy is absent, sleep instead
Buddy explains!
The straight part
We know that "Very keen" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case very keen = zealous.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 ZEALOUS mean?
ZEALOUS adjective- Full of zeal; ardent, fervent; exhibiting enthusiasm or strong passion.