How tuna may be packed

INOIL

Think of a common liquid used to preserve canned fish, often found in pantry staples like sardines or anchovies.

The clue "How tuna may be packed" hints at a common way tuna is preserved or sold. "In oil" is a standard packaging method, and the answer "INOIL" is simply that phrase written as one word. There’s no wordplay here—it’s a straightforward definition where the answer describes exactly how tuna is often stored.