Mowed randomly around a field (6)
I believe the answer is:
meadow
'field' is the definition.
(a meadow is a field)
'mowed randomly around a' is the wordplay.
'randomly' is an anagram indicator (I've seen 'roaming randomly' mean this).
'around' is an insertion indicator.
'mowed' is an anagram of 'medow'.
'medow' going around 'a' is 'MEADOW'.
(Other definitions for meadow that I've seen before include "A field of rich grass" , "A field of lush grass" , "it's green here" , "area of grassland" , "In rural location" .)