Time to get most sophisticated headdress (6)
I believe the answer is:
turban
'headdress' is the definition.
(turban is a kind of headdress)
'time to get most sophisticated' is the wordplay.
'time' becomes 't' (abbreviation).
'to get' says to put letters next to each other.
'most' means to remove the last letter.
'sophisticated' becomes 'urbane' (synonyms).
'urbane' with its last letter removed is 'urban'.
't'+'urban'='TURBAN'
(Other definitions for turban that I've seen before include "Sikh headdress of scarf wound around head" , "Religious head covering" , "Eastern head-dress" , "Wound headgear" , "Piece of cloth worn around the head" .)