Clue: Operational legacy: a connection problem (4,6)
Answer: SCAR TISSUE
Explanation: Operational legacy: a connection problem (4,6)
I thought at first that this was just a cryptic definition, but it now looks like a charade of SC (semicolon, ':') plus 'a' plus RT (radio telephony, 'connection') plus ISSUE ('problem'), which gives us an extended definition.