The most common and most likely answer to this crossword clue is the 6 letter word THIGHS
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More clues leading to the result THIGHS
Buddy explains!
The straight part
We know that "Members (legs) at their thickest" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case members (legs) at their thickest = thighs.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 THIGHS mean?
THIGHS noun- The upper leg of a human, between the hip and the knee.
- That part of the leg of vertebrates (or sometimes other animals) which corresponds to the human thigh in position or function; the tibia of a horse, the tarsus of a bird; the third leg-section of an insect.