Care to be converted to land (4)
I believe the answer is:
acre
'to land' is the definition.
(I've seen this before)
'care to be converted' is the wordplay.
'to be converted' is an anagram indicator.
'care' with letters rearranged gives 'ACRE'.
(Other definitions for acre that I've seen before include "Imperial land measure" , "Measure of land area" , "Care about this bit of land" , "Muslims here besieged" , "4840 sq yds" .)