### Clue: Tiny amount of money: gold rush's beginning to make you cross (7)
### Answer: CENTAUR 
 ### Explanation: Definition: cross
A charade of CENT ('tiny amount of money') plus AU (chemical symbol, 'gold') plus R ('**R**ush's beginning'). In one version of the story, centaurs were indeed a cross, between the man Centaurus and mares.