### Clue: Praise dropping a train network for non-union shenanigans (8)
### Answer: ADULTERY 
 ### Explanation: Definition: non-union shenanigans
 "adulate"(to praise/to idolise) **minus**(dropping) "A" + RY(abbrev. for "railway"/train network).
Defn: …/secret activity outside wedlock/non-union.