The most common and most likely answer to this crossword clue is the 8 letter word SAMPHIRE
I've seen this crossword clue in The Daily Telegraph
S
A
M
P
H
I
R
E
More clues leading to the result SAMPHIRE
- Big horse eats a medium soft plant
- County invites a politician to see coastal growth
- Edible plant with a measure of speed gobbled by father
- Maritime plant providing booster in county
- Plant a politician in county
- Missile launch reported in coastal plant
- Plant becoming current in county
- . Plant producing surface-to-air missiles is on lease; admits President
- A politician impressed by county’s glasswort
Buddy explains!

The straight part
We know that "Plant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plant = samphire.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 SAMPHIRE mean?
SAMPHIRE noun- One of several salt-tolerant plants, some edible