Care about size of field? (4)
I believe the answer is:
acre
'size of field?' is the definition.
'acre' can be an answer for 'field?' (I've seen this in another clue). I'm not sure about the 'size of' bit.
'care about' is the wordplay.
'about' indicates anagramming the letters.
'care' anagrammed gives 'ACRE'.
Can you help me to learn more?
(Other definitions for acre that I've seen before include "Measure of land area" , "4840 sq yds" , "amount of land" , "Site of battle" , "point four nought five of a hectare" .)