How do I solve 4 down in Times Cryptic 29533?

Question

Accepted Answer

4 down reads "Fitness coach working on a laser printer" (8,7 letters); the answer is PERSONALTRAINER. 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.

Fitness coach working on a laser printer (8,7)

4D — Fitness coach working on a laser printer (8,7) — PERSONALTRAINER