The most common and most likely answer to this crossword clue is the 5 letter word POPPY
P
O
P
P
Y
Buddy explains!

The straight part
We know that "Blossom" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case blossom = poppy.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 POPPY mean?
POPPY noun- Any plant of the genus Papaver or the family Papaveraceae, with crumpled, often red, petals and a milky juice having narcotic properties; especially the common poppy or corn poppy (Papaver rhoeas) which has orange-red flowers; the flower of such a plant.
- A bright red colour tinted with orange, like that of the common poppy flower.
- A simple artificial poppy flower worn in a buttonhole or displayed in other contexts to remember those who died in the two World Wars and other armed conflicts, especially around Remembrance Sunday.
- Of a bright red colour tinted with orange, like that of the common poppy flower (Papaver rhoeas).
- Having a popping or bursting sound.
- Of a beverage: resembling soda pop; effervescent, fizzy.
- Of eyes: protruding, sticking out.
- Popular.
- Typical, or in the style, of pop music.
- One's father or grandfather, or a male authority figure having similar standing.