How do I solve 6 down in Daily Telegraph Cryptic 31253?

Question

Accepted Answer

6 down reads "Immaculate Lulu dines out" (9 letters); the answer is UNSULLIED. 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.

Immaculate Lulu dines out (9)

6D — Immaculate Lulu dines out (9) — UNSULLIED