The most common and most likely answer to this crossword clue is the 7 letter word GRANULE
G
R
A
N
U
L
E
More clues leading to the result GRANULE
- Mixed glue to secure charged particle
- Elderly relative mentioned Christmas a little bit
- Turned up extract from Phoebe: Lunar Goddess – fine piece
- Tiny particle found in surgery on ear and lung
- Real gun shot tiny pellet
- Greek character enthralled by unusually large particle
- Small particle, for example, collected from the moon and returned
Buddy explains!

The straight part
We know that "particle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case particle = granule.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 GRANULE mean?
GRANULE noun- A tiny grain, a small particle.
- A small structure in a cell.
- A particle from 2 to 4 mm in diameter, following the Wentworth scale
- A small mark in the photosphere of the sun caused by convection currents. See also Wikipedia:Granule (solar physics).