New online journal by daughter sent up inhabitant (7)
I believe the answer is:
denizen
'inhabitant' is the definition.
(I know that inhabitant can be written as denizen)
'new online journal by daughter sent up' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'online' becomes 'e' (abbreviation for electronic, e.g. in ecommerce).
'journal by' becomes 'zine' (I can't justify this - if you can you should give a lot more credence to this answer).
'daughter' becomes 'd' (genealogical abbreviation).
'sent up' says the letters should be written backwards.
'n'+'e'+'zine'+'d'='nezined'
'nezined' backwards is 'DENIZEN'.
Can you help me to learn more?
(Other definitions for denizen that I've seen before include "Inhabitant (of the deep?)" , "Person in foreign country enjoying rights of natives" , "Resident" , "Enid Zen (anag) - inhabitant of a particular place" , "Inhabitant, occupant" .)