Resented contest separating half of field (6)
I believe the answer is:
envied
'resented' is the definition.
The answer and definition can be both to do with human feelings as well as being past participle verbs.
Perhaps you can see an association between them that I can't see?
'contest separating half of field' is the wordplay.
'contest' becomes 'vie' (I've seen this before).
'separating' indicates putting letters inside.
'half of field' becomes 'end' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'vie' placed within 'end' is 'ENVIED'.
Can you help me to learn more?
(Other definitions for envied that I've seen before include "Was jealous of, begrudged" , "Was jealous of (someone)" , "Desired" , "Looked greenly" , "Begrudged, coveted" .)