The most common and most likely answer to this crossword clue is the 8 letter word GATHERED
I've seen this crossword clue in Independent
G
A
T
H
E
R
E
D
More clues leading to the result GATHERED
- Deduced the grade must be reviewed
- Did mass, that’s also understood
- Grade the produce harvested
- Got to gallivant around thither
- 3 could make the grade
- Assembled to be picked up
- Assembled in meeting at her edifice
- Collected good articles on Democrat
- Met at this place inside empty ground
- Learned that woman did not let out skirts
Buddy explains!

The straight part
We know that "3" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case 3 = gathered.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 GATHERED mean?
GATHERED verb- To collect; normally separate things.
- To bring parts of a whole closer.
- To infer or conclude; to know from a different source.
- (of a boil or sore) To be filled with pus
- To collect molten glass on the end of a tool.
- To gain; to win.
- Focused, centered, achieving a state of shared mysticism.