Again evaluated beasts of burden kept in deer's ground (10)
I believe the answer is:
reassessed
'again evaluated' is the definition.
('assessed' can be a synonym for 'evaluated' so perhaps 'reassessed' is OK for 'again evaluated')
'beasts of burden kept in deer's ground' is the wordplay.
'beasts of burden' becomes 'asses' (I've seen this before).
'kept in' is an insertion indicator.
'ground' indicates anagramming the letters ('grind' the letters into a new form).
'deers' anagrammed gives 'resed'.
'asses' put inside 'resed' is 'REASSESSED'.
(Other definitions for reassessed that I've seen before include "Evaluated again" , "Calculated again" , "Estimated afresh" .)