Clue: President's in la-la land! Go — and quickly! (4,1,4)
Answer: LIKE A SHOT
Explanation: President's in la-la land! Go — and quickly! (4,1,4)
**IKE** (nickname of Dwight D Eisenhower, so "president") *in* **LA** (Los Angeles, or "La-la Land") + **SHOT** ("go")