I thought Dean Mayer was hard!!!!
16d p?????i?e Rodent or cat initially up in tree (9)
18a ?e?r?e ???????n Troops around here go off musician (6,8)
4a ???????s Plant from a North American bog like this (8)
10a r???s???? Hospital doctor injecting substance right into backside(9)
TIA
This puzzle is published two weeks after your Sunday times so I am just now fighting with this one. Can someone please parse 18a for me? Specifically where do troops come in?