The most common and most likely answer to this crossword clue is the 8 letter word DAFFODIL
I've seen this crossword clue in The Daily Telegraph
D
A
F
F
O
D
I
L
More clues leading to the result DAFFODIL
- Bloomer by lawyer taking raised hat off
- Bulb‘s raised cover gone these days
- Bloomer as Democrat, rotten, flipped in parliament
- Irish house admitting salute, in turn, for Welsh symbol
- Cover rage after turning to accept Foreign Office bloomer
- Bloom to remove hat when returning, entering house in Dublin
- Bulb in lift lifted in house
- Flower opened, a daisy’s beginning to come up
- Recalled top of fancy flower
- Five hundred wrongly laid off — it’s a bloomer
Buddy explains!

The straight part
We know that "flower" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flower = daffodil.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 DAFFODIL mean?
DAFFODIL noun- A bulbous plant of the genus Narcissus, with yellow flowers and a trumpet shaped corona, especially Narcissus pseudonarcissus, the national flower of Wales.
- A brilliant yellow color, like that of a daffodil.
- Of a brilliant yellow color, like that of a daffodil.