### Clue: Power and sex will be mine! (3)
### Answer: PIT 
 ### Explanation: Definition: mine
 P(symbol for "power" in physics) **plus**(and) IT(cf. 12 across).
Defn: …/a hole in the ground from which minerals are extracted.
What is it they say?  Three things make the world go round – wealth, power and sex: if you have one, you can have either or both of the other two.