Google rival (5)
I believe the answer is:
yahoo
'google rival' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for yahoo that I've seen before include "Lout, boorish person" , "Boorish louts" , "Savage" , "Exclamation of joy; brute" , "Race of brutes in Gulliver's Travels" .)