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Happy New Year to all.
I have 75 questions, with just one remaining to get. I hope someone can help. All the answers "relate to trees and shrubs".
"100 infiltrate Asian country and hold fast" (9)
Indicator is a possibility, but how does "tor" come from "hold fast"?
Thanks in advance.

CHINCAPIN, chinquapin, chinkapin.

Castanea pumila

Days of head-scratching, hours of googling, or five minute wait for a reply on this forum. (Have to do the thinking first though, before asking for help!)
Thanks, and have a great new year.