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The one-time queen's upset - purgative needed (5)

S _ N _ A

The initial S is from "steel" as the answer to "Engineering material used for weighing by the yard!" (5) I have no idea why "steel" might be the answer, other than it fits with the other letters I have!

Senna

That was quick- thank you. Don't understand why but I'm away to educate myself.

A steelyard is a type of balance that works by moving the counterweight closer or further from the fulcrum, rather than increasing or decreasing it, as on a conventional balance

One time queen's upset. Anne's reversed!
Senna's act as purgatives and are used in medicine.