Source of power in the Information Age at peak (9)
I believe the answer is:
generator
'source of power' is the definition.
(a generator generates power)
'information age at peak' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'age' becomes 'era' (both can mean a long time).
'at' is a charade indicator (letters next to each other).
'peak' becomes 'tor' (a tor is a rocky peak).
'gen'+'era'+'tor'='GENERATOR'
'in the' is the link.
(Other definitions for generator that I've seen before include "Creator" , "Electricity producer" , "It gives power" , "Engine to produce electricity" , "Power source" .)