Son skipping exclusive exam concerning public choices (9)
I believe the answer is:
electoral
'son skipping exclusive exam concerning public choices' is the definition.
I can't judge whether this definition defines the answer.
'son skipping exclusive exam concerning' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'skipping' indicates named letters should be taken away (to skip a place is to leave it).
'exclusive' becomes 'select' (I've seen this before).
'exam concerning' becomes 'oral' (I can't explain this - if you can you should believe this answer much more).
'select' with 's' removed is 'elect'.
'elect'+'oral'='ELECTORAL'
Can you help me to learn more?
(Other definitions for electoral that I've seen before include "Like sort of college" , "concerning voters" , "List of voters" , "kind of US college" , "concerned with votes" .)