Casually dressed, in a way, 7 letters
Dressed informally, perhaps, 7 letters
Lacking a ring around the collar?, 7 letters
Connector of one electric power system with another: 2 wds., 7 letters
Phone-system connection, 7 letters
Private phone channel between offices, 7 letters
Private telephone channel, 7 letters
Telecomunications link, 7 letters
Communications links, 8 letters
Direct communications links, 8 letters