Peasant in bondage, ending in thrall (5)
I believe the answer is:
yokel
'peasant' is the definition.
(I've seen this before)
'bondage ending in thrall' is the wordplay.
'bondage' becomes 'yoke' (I've seen this in another clue).
'ending in' suggests the final letters.
The final letter of 'thrall' is 'l'.
'yoke'+'l'='YOKEL'
'in' acts as a link.
(Other definitions for yokel that I've seen before include "Unsophisticated rustic" , "Rustic - peasant" , "Countryman" , "Rustic person (derogatory)" , "Country bumpkin" .)