Like one on a large piece of land (4)
I believe the answer is:
asia
'land' is the definition.
(I know that Asia is a continent)
'like one on a' is the wordplay.
'like' becomes 'as'.
'one' becomes 'I' (Roman numeral).
'on' means one lot of letters go next to another.
'as'+'i'+'a'='ASIA'
'large piece of' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for asia that I've seen before include "Thailand and its location" , "its pampered jades couldn't draw much?" , "group of countries" , "Continent in which India is situated" , "Stretch of land" .)