Ordinary public land (6)
I believe the answer is:
common
This clue is a triple definition!
'ordinary' is the first definition.
('common' can be similar in meaning to 'ordinary')
'public' is the second definition.
('common' can be similar in meaning to 'public')
'land' is the third definition.
(I've seen this before)
(Other definitions for common that I've seen before include "Ordinary, nothing special" , "Met with frequently" , "Shared ground" , "Regular winter illness" , "General - public" .)