Lament online network going the wrong way (5)
I believe the answer is:
dirge
'lament' is the definition.
('dirge' can be a synonym of 'lament')
'online network going the wrong way' is the wordplay.
'online' becomes 'e' (as in e-mail or e-commerce).
'network' becomes 'grid' (grid is a kind of network).
'going the wrong way' shows that the letters should be reversed in order.
'e'+'grid'='egrid'
'egrid' written backwards gives 'DIRGE'.
(Other definitions for dirge that I've seen before include "feature of funeral" , "Funereal hymn" , "Song or hymn of mourning" , "Keen; lament" , "A slow mournful song, lament for the dead" .)