The most common and most likely answer to this crossword clue is the 8 letter word MIDRIFFS
I've seen this crossword clue in The Daily Telegraph
M
I
D
R
I
F
F
S
More clues leading to the result MIDRIFFS
Buddy explains!
The straight part
We know that "lower regions" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lower regions = midriffs.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 MIDRIFFS mean?
MIDRIFFS noun- The middle section of the human torso, from below the chest to above the waist