Interconnected system of things or people (7)
I believe the answer is:
network
'interconnected system of things or people' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for network that I've seen before include "Intricately connected system" , "Trek now (anag.)" , "Group of transport routes" , "Organisation" , "Rail or road system" .)