Freed in grass around fields (8)
I believe the answer is:
released
'freed' is the definition.
('release' can be a synonym of 'free')
'grass around fields' is the wordplay.
'grass' becomes 'reed' (I've seen this before).
'around' is an insertion indicator.
'fields' becomes 'leas' (I've seen this before).
'reed' placed around 'leas' is 'RELEASED'.
'in' acts as a link.
(Other definitions for released that I've seen before include "Freed from confinement" , "Set free" , "free after imprisonment?" , "Let out - let out again" , "Discharged" .)