The most common and most likely answer to this crossword clue is the 10 letter word NETTLESOME
I've seen this crossword clue in The Times
N
E
T
T
L
E
S
O
M
E
Buddy explains!
The straight part
We know that "Trying" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trying = nettlesome.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 NETTLESOME mean?
NETTLESOME adjective- (of a person, thing, situation, etc.) Causing irritation, annoyance, or discomfort; bothersome, irksome.
- (of a task, problem, etc.) Thorny; difficult to deal with, especially due to being complex or tricky.