The most common and most likely answer to this crossword clue is the 8 letter word FORESTRY
I've seen this crossword clue in The Daily Telegraph
F
O
R
E
S
T
R
Y
More clues leading to the result FORESTRY
- Woodman's line of business, needing fine minerals to test
- Conservation industry put to the test, after warnings of course
- Warnings test woodland management
- Scientific study encompassing many branches
- Leading positions go in management of large plants
- Scientific study of second test after warning
- Rural activity supporting economy, ultimately involving others
- Scientific study of warnings on crack
- Second shot after warning shout clearing woods?
Buddy explains!

The straight part
We know that "Scientific study encompassing many branches" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case scientific study encompassing many branches = forestry.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 FORESTRY mean?
FORESTRY noun- The science of planting and growing trees in forests.
- The art and practice of planting and growing trees in forests.
- The art and practice of cultivating, exploiting and renewing forests for commercial purposes.
- Commercial tree farming.
- A tree farm.