The most common and most likely answer to this crossword clue is the 8 letter word FLOPPIER
I've seen this crossword clue in The Guardian
F
L
O
P
P
I
E
R
Buddy explains!
The straight part
We know that "less rigid" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case less rigid = floppier.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 FLOPPIER mean?
FLOPPIER adjective- Limp, not hard, firm, or rigid; flexible.