Oddly tribal, real headdress (5)
I believe the answer is:
tiara
'headdress' is the definition.
(tiara is a kind of headdress)
'oddly tribal real' is the wordplay.
'oddly' means one should take alternating letters.
'tribal'+'real'='tribalreal'
The alternating letters of 'tribalreal' are 'TIARA'.
(Other definitions for tiara that I've seen before include "Jewelled headwear" , "Half a crown!" , "Jewelled head wear" , "Jewelled headband" , "Ornamental head gear" .)