### Clue: Originally carp here at "revolutionary" trains following first of hold-ups (8)
### Answer: HATCHERY 
 ### Explanation: Definition: Originally carp here
 [AT + CHE(Guevara, Argentinian Marxist revolutionary) + RY(abbrev. for the railway;trains) ] **placed after**(following, in an across clue) **1st letter of**(first of) "hold-ups " ].
Defn: Where carp (and other fish) might be hatched;originate from.