The most common and most likely answer to this crossword clue is the 8 letter word GALANGAL
I've seen this crossword clue in Independent
G
A
L
A
N
G
A
L
More clues leading to the result GALANGAL
Buddy explains!
The straight part
We know that "aromatic plant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case aromatic plant = galangal.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 GALANGAL mean?
GALANGAL noun- Any of several east Asian plants of genera Alpinia and Kaempferia in the ginger family, used as a spice, but principally Alpinia galanga.