### Clue: Reverse network grids oddly broadcast beeps, perhaps (4,6)
### Answer: TIME SIGNAL 
 ### Explanation: Definition: beeps, perhaps
  **Reversal of**(reverse) [LAN(abbrev. for local area network, where computers within a limited area are linked) GIS(first, third & fifth letters,oddly of "grids") EMIT(issue,broadcast)]
Defn:  Eg.  "At the beep/tone, the time will be …."