Puerile comments about sex incredibly asinine (9)
I believe the answer is:
inanities
'puerile comments' is the definition.
Although both the answer and definition are plural nouns, I can't understand how they can define each other.
'sex incredibly asinine' is the wordplay.
I cannot really see how this works, but
'sex' could be 'it' (a common euphemism) and 'it' is found in the answer.
an anagram of 'asinine' is 'inanies' which is within the remaining letters.
This accounts for all the letters.
This explanation may well be incorrect...
'about' is the link.
Can you help me to learn more?
(Other definitions for inanities that I've seen before include "They're lacking in ideas" , "Nonsense" .)