Talisman gives a stubborn fellow time (6)
I believe the answer is:
amulet
'talisman' is the definition.
(synonyms)
'a stubborn fellow time' is the wordplay.
'stubborn fellow' becomes 'mule' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'time' becomes 't' (abbreviation).
'a'+'mule'+'t'='AMULET'
'gives' acts as a link.
Can you help me to learn more?
(Other definitions for amulet that I've seen before include "Protective jewellery" , "Protective ornament" , "Protective trinket" , "Lucky charm, talisman" , "Mascot" .)