Set of posts in line dividing wetlands (4)
I believe the answer is:
blog
'set of posts' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'line dividing wetlands' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'dividing' is an insertion indicator (inserted letters divide the word).
'wetlands' becomes 'bog' (I am not sure about this - if you are sure you should believe this answer much more).
'l' going into 'bog' is 'BLOG'.
'in' is the link.
Can you help me to learn more?
(Other definitions for blog that I've seen before include "Online journal" , "Web diary" , "Internet journal" , "published journal" , "Personal opinion website" .)