How do I solve 12 down in Times Cryptic 5218?

Question

Accepted Answer

12 down reads "Basic ingredients cooked up alarm waiter" (3,8 letters); the answer is RAW MATERIAL. It's an anagram clue: the answer is a rearrangement of letters supplied by the clue itself. Look for an indicator like 'mixed', 'broken', 'cooked', or 'wild', and find a phrase whose letters add up to the answer's length. The full step-by-step breakdown is on this page.

Basic ingredients cooked up alarm waiter (3,8)

12D — Basic ingredients cooked up alarm waiter (3,8) — RAW MATERIAL