The most common and most likely answer to this crossword clue is the 5 letter word SEPAL
I've seen this crossword clue in The Daily Telegraph
S
E
P
A
L
More clues leading to the result SEPAL
- Rose’s part in Sophocles’s Antigone finally overcoming friend
- Bit of a bloomer, being as far as possible from NW China?
- Rising end of petal imitates part of flower
- Outer part of some bud?
- Bit of a bloomer finishes off chess game — mate
- Leaf or some empty bud
- Home counties chum offers something green
- Bit of a bloomer breaking into grandiose palace
- A bit of a bloomer from friend in the Home Counties
- Flower part is close protecting head of plant
Buddy explains!

The straight part
We know that "A bit of a bloomer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a bit of a bloomer = sepal.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 SEPAL mean?
SEPAL noun- One of the component parts of the calyx, particularly when the sepals in a plant's calyx are not fused into a single structure.