The most common and most likely answer to this crossword clue is the 10 letter word SPINSTERLY
S
P
I
N
S
T
E
R
L
Y
More clues leading to the result SPINSTERLY
Buddy explains!
The straight part
We know that "as per lifelong non-union member" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case as per lifelong non-union member = spinsterly.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.