The most common and most likely answer to this crossword clue is the 5 letter word GOWAN
G
O
W
A
N
Buddy explains!

The straight part
We know that "bloomer that’s hand-picked for chain in north?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bloomer that’s hand-picked for chain in north? = gowan.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 GOWAN mean?
GOWAN noun- The common daisy.
- Decomposed granite.