Clue: Heads for repast in hall after taking in college buttery? (4)
Answer: RICH
Explanation: Definition: buttery
**R**(epast)** I**(n) **H**(all) *taking in* **C**(ollege). 
*C for college for the second time in the puzzle? At first, I was going to cry foul, but it's a crossing letter in the two clues ARRE**C**T and RI**C**H, so maybe this is actually quite a clever device?