A stubborn person takes time to display charm (6)
I believe the answer is:
amulet
'charm' is the definition.
(synonyms)
'a stubborn person takes time' is the wordplay.
'stubborn person' becomes 'mule' (I've seen this in another clue).
'takes' is a charade indicator (letters next to each other).
'time' becomes 't' (abbreviation).
'a'+'mule'+'t'='AMULET'
'to display' acts as a link.
(Other definitions for amulet that I've seen before include "Protective charm" , "Small charm" , "Lucky ornament" , "Lucky trinket" , "Protective jewellery" .)