The most common and most likely answer to this crossword clue is the 8 letter word PUFFBALL
I've seen this crossword clue in The Times
P
U
F
F
B
A
L
L
More clues leading to the result PUFFBALL
Buddy explains!

The straight part
We know that "Simple life" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case simple life = puffball.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 PUFFBALL mean?
PUFFBALL noun- Any of various fungi that produce a cloud of brown dust-like spores from their mature fruiting bodies.