One piece of turf outside recently cut off (8)
I believe the answer is:
isolated
'cut off' is the definition.
(thesaurus)
'one piece of turf outside recently' is the wordplay.
'one' becomes 'i' (Roman numeral).
'piece of turf' becomes 'sod' (I've seen this before).
'outside' is an insertion indicator.
'recently' becomes 'late' (I've seen this in other clues).
'sod' enclosing 'late' is 'solated'.
'i'+'solated'='ISOLATED'
(Other definitions for isolated that I've seen before include "kept apart from others" , "Cut off or left behind" , "Set apart from others" , "Set apart, quarantined" , "Placed apart from others" .)