Part of a web address (3)
I believe the answer is:
dot
'part of a web address' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dot that I've seen before include "Tiny speck" , "One of the signals in Morse code" , "'Spot, tiny mark (3)'" , "scatter" , "Flyspeck: period in a web address" .)