Complain at method in network (7)
I believe the answer is:
railway
'network' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'complain at method' is the wordplay.
'complain' becomes 'rail' (railing is a kind of complaining).
'at' says to put letters next to each other.
'method' becomes 'way' (I've seen this before).
'rail'+'way'='RAILWAY'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for railway that I've seen before include "Train track" , "Track for locomotives" , "Means of transport" , "Romney, Hythe & Dymchurch, for example" , "Track system" .)