In part loser — finding he was tied to land (4)
I believe the answer is:
serf
'he was tied to land' is the definition.
(serfs were tied to land in feudal times)
'in part loser finding' is the wordplay.
'in part' indicates the answer is hidden within the clue.
'SERF' can be found hidden inside 'loser finding'.
(Other definitions for serf that I've seen before include "One bound to work" , "Feudal peasant" , "Thrall" , "One bound to the land" , "Feudal labourer" .)