Thanks poet for tunic (6)
I believe the answer is:
tabard
'tunic' is the definition.
(tabard is a kind of tunic)
'thanks poet' is the wordplay.
'thanks' becomes 'ta' (UK informal version of 'thank you').
'poet' becomes 'bard' (bard is a kind of poet).
'ta'+'bard'='TABARD'
'for' acts as a link.
(Other definitions for tabard that I've seen before include "Historical tunic" , "Inn where pilgrims met" , "Herald's coat or tunic" , "Herald's jacket" , "Sleeveless jacket" .)