### Clue: Nerd you and I must get in the sack (after some gyrating) (5)
### Answer: DWEEB 
 ### Explanation: Definition: Nerd
 WE(collective pronoun for you and I) **contained in**(must get in) **reversal of**(… after some gyrating) BED(for which "sack" is slang, as in "to hit the sack").