OMG....I need to get inside your head...hope it's solved before bedtime, lol

Initially, it might be!

Not it WWOS.

Sorry WWOS, that's not the answer.

my last go at this....breastbone? (has 10 letters...lol)

Sorry twyngwyn, not it. Hope you sleep well. 🙂

last attempt for tonight - buttresses?  .......    supports, and the tresses part from actresses?

Nope WWOS, sorry.