The most common and most likely answer to this crossword clue is the 9 letter word ECOLOGIST
I've seen this crossword clue in Financial Times
E
C
O
L
O
G
I
S
T
More clues leading to the result ECOLOGIST
- I could be worried to see lost ice go
- As one studying certain relationships, I got close, involved
- Green specialist in City loves squeezing large marrow
- One re-imagining geopolitics without industrialism and petroleum, primarily?
- Green company record is captured by film
- English officer meaning to arrest old green campaigner
- Record one’s temperature, following author and environmental expert
- American soldier wears coolest ensemble in green
Buddy explains!

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 ECOLOGIST mean?
ECOLOGIST noun- A scholar of ecology.