Getting on, afraid to follow naughty porn sign (2,6,7)
I believe the answer is:
no spring chicken
'getting' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'afraid to follow naughty porn sign' is the wordplay.
'afraid' becomes 'chicken' (I can't explain this - if you can you should believe this answer much more).
'to follow' is a charade indicator (letters next to each other) (some letters go after or follow others).
'naughty' is an anagram indicator.
'porn'+'sign'='pornsign'
'pornsign' with letters rearranged gives 'nospring'.
'chicken' after 'nospring' is 'NO SPRING CHICKEN'.
'on' acts as a link.
Can you help me to learn more?
(Other definitions for no spring chicken that I've seen before include "old?" , "not young any more" , "Veteran" , "unseasoned meat, might you say?" , "One who's seasoned" .)