Part of WWW (3)
I believe the answer is:
web
'part of www' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for web that I've seen before include "Spider's network" , "Spider's trap" , "Spider's home" , "Oh what a tangled one we weave, when first we practise to deceive" , "Spider's construction" .)