Internet whiz nearby cut off (9)
I believe the answer is:
cybernaut
'internet whiz' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'nearby cut off' is the wordplay.
'off' indicates anagramming the letters.
'nearby'+'cut'='nearbycut'
'nearbycut' anagrammed gives 'CYBERNAUT'.
Can you help me to learn more?
(Other definitions for cybernaut that I've seen before include "Buy nectar (anag) - Internet user" , "Surfer perhaps" .)