A stubborn person has time for charm (6)
I believe the answer is:
amulet
'for charm' is the definition.
(synonyms)
'a stubborn person has time' is the wordplay.
'stubborn person' becomes 'mule' (I've seen this in another clue).
'has' is a charade indicator (letters next to each other).
'time' becomes 't' (abbreviation).
'a'+'mule'+'t'='AMULET'
(Other definitions for amulet that I've seen before include "Charm worn against bad luck" , "Mascot" , "Protective jewellery" , "Trinket worn to protect one from evil" , "Lucky charm, talisman" .)