Easy job, turning over small bit of turf (4)
I believe the answer is:
doss
'easy job' is the definition.
(a doss is something easy)
'turning over small bit of turf' is the wordplay.
'turning over' shows that the letters should be reversed in order.
'bit of' suggests taking the first letters.
'turf' becomes 'sod' (both can mean a piece of grass).
The first letter of 'small' is 's'.
's'+'sod'='ssod'
'ssod' backwards is 'DOSS'.
(Other definitions for doss that I've seen before include "go to bed" , "In slang, sleep on sods" , "Sleep in a makeshift bed" , "Sleep like a tramp" , "easily accomplished" .)