Care about time on some land (7)
I believe the answer is:
acreage
'some land' is the definition.
(I've seen this in another clue)
'care about time on' is the wordplay.
'about' is an anagram indicator.
'time' becomes 'age' (an age is a period of time).
'on' is an insertion indicator (as in clothing 'on' a person).
'care' with letters rearranged gives 'crea'.
'crea' inserted into 'age' is 'ACREAGE'.
(Other definitions for acreage that I've seen before include "Measure of land" , "Measure used by farmer" , "Extent of ground" , "expanse" , "Amount of land" .)