Stare at internet search engine, losing energy (4)
I believe the answer is:
ogle
'stare at' is the definition.
(to ogle is to stare at in a rude way)
'internet search engine losing energy' is the wordplay.
'internet search engine' becomes 'google' (Google is a search engine).
'losing' is a deletion indicator.
'energy' becomes 'go' (I've seen this in other clues).
'google' with 'go' removed is 'OGLE'.
(Other definitions for ogle that I've seen before include "Lasciviously look" , "Gaze at lecherously" , "Look at amorously" , "John -, diarist, - Waugh, novelist" , "Look flirtatiously at" .)