Charlie nervously creeps by a world infested by trolls? (10)
I believe the answer is:
cyberspace
'world infested by trolls?' is the definition.
(as in online trolls)
'charlie nervously creeps by a' is the wordplay.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'nervously' indicates anagramming the letters.
'creeps'+'by'+'a'='creepsbya'
'creepsbya' is an anagram of 'yberspace'.
'c'+'yberspace'='CYBERSPACE'
(Other definitions for cyberspace that I've seen before include "surfing milieu" , "whole virtual environment" , "Virtually real environment" , "Creepy scab (anag.)" , "Worldwide computer environment" .)