In court, non-U individual displaying small crown (7)
I believe the answer is:
coronet
'small crown' is the definition.
(I've seen this before)
'in court non-u individual' is the wordplay.
'in' means one lot of letters goes inside another.
'non' suggests deleting specific letters.
'individual' becomes 'one'.
'court' with 'u' taken away is 'cort'.
'cort' enclosing 'one' is 'CORONET'.
'displaying' acts as a link.
(Other definitions for coronet that I've seen before include "jewelled headdress" , "Simple crown" , "Circular floral head decoration" , "Peer's headgear" , "sign of rank" .)