A stubborn person takes time to display charm (6)
I believe the answer is:
amulet
'charm' is the definition.
(I know that amulet is a type of charm)
'a stubborn person takes time' is the wordplay.
'stubborn person' becomes 'mule' (I've seen this in another clue).
'takes time' becomes 't' (I've seen this in other clues).
'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" .)