The most common and most likely answer to this crossword clue is the 13 letter word EXPERIMENTING
E
X
P
E
R
I
M
E
N
T
I
N
G
Buddy explains!
The straight part
We know that "T" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case t = experimenting.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 EXPERIMENTING mean?
EXPERIMENTING verb- To conduct an experiment.
- To experience; to feel; to perceive; to detect.
- To test or ascertain by experiment; to try out; to make an experiment on.
- Experimentation