Lament opening of electricity network being put back (5)

I believe the answer is:
dirge
'lament opening' is the definition.
'dirge' can be an answer for 'lament' (I've seen this in another clue). I am not certain of the 'opening' bit.
'electricity network being put back' is the wordplay.
'electricity' becomes 'e' (this might be a standard abbreviation of which I'm unaware).
'network' becomes 'grid' (grid is a kind of network).
'being put back' says the letters should be written in reverse.
'e'+'grid'='egrid'
'egrid' written backwards gives 'DIRGE'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for dirge that I've seen before include "Mournful chant" , "lamentable composition" , "dreary tune" , "Sombre music" , "Dreary song" .)
