Boorish character, vacuous idiot (5)
I believe the answer is:
crass
'boorish' is the definition.
(I've seen this before)
'character vacuous idiot' is the wordplay.
'vacuous' says to hollow out the word (remove centre letters).
'idiot' becomes 'ass' (both can mean a stupid person).
'character' with its middle removed is 'cr'.
'cr'+'ass'='CRASS'
(Other definitions for crass that I've seen before include "Insensitively stupid" , "Grossly stupid, tactless" , "Indelicate" , "Tactless, boorish" , "Asinine" .)