### Clue: It's hard for unknown, quiet, egghead with daughter out of bed to be overexcited (5,2)
### Answer: HYPED UP 
 ### Explanation: Definition: overexcited
 H(abbrev. for "hard") **plus**(for) Y(symbol for an unknown quantity in maths) + P(abbrev. for "piano", musical direction to play quietly) + **the 1st letter of**(…head) "egg " **plus**(with) D(abbrev. for "daughter") + UP(arisen from;out of bed).