The most common and most likely answer to this crossword clue is the 10 letter word SNAPDRAGON
I've seen this crossword clue in Independent
S
N
A
P
D
R
A
G
O
N
More clues leading to the result SNAPDRAGON
- Simple game won’t come to an end — I go to bed
- One in bed is game to continue for a while!
- Flower child about to snooze, faced with boring event
- Fury after game, seeing bloomer
- Doddery grandpa gets lad round for a plant
- That's the same monster plant
- Plant boy’s brought round moved grandpa
- Plant's shoot bore old nodules at the top
- Photograph last plant
- Son horsing about with grandpa makes bloomer
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 = snapdragon.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 SNAPDRAGON mean?
SNAPDRAGON noun- Any plant of the genus Antirrhinum, with showy yellow, white or red flowers.
- A game in which raisins are snatched from a vessel containing burning brandy, and eaten; the substance snatched and eaten during the playing of the game; the vessel used for the game.