Techie type emerging when the power died finally (4)
I believe the answer is:
nerd
'techie type' is the definition.
(I've seen this in another clue)
'when the power died finally' is the wordplay.
'finally' indicates one should take the final letters.
The last letters of 'when the power died' are 'NERD'.
'emerging' acts as a link.
(Other definitions for nerd that I've seen before include "One lacking social skills" , "Computer geek?" , "knowledgable geek" , "Boringly studious person" , "Boring person" .)