18 - you need an synonym for honest + a large branch of a tree which together give a presenter of the tv series Nationwide.
58 - the limit at altitude beyond which trees don't grow on the mountain is a feature of a tree log for eg that denotes its age
87 gasper = cigarette, Tommy - first WW soldier; climbing plant.
I still am struggling with 25 Having climbed the thin branch when pregnant (2,3,5)