I got a couple of clues early on but it took me ages to get really going. I managed to finish it, eventually, but this was the toughest I have tackled for a while; at least, I found it tough.
I had SCIPIO for the "Old general" but I must be having a blind spot as I can't understand the subsidiary indication. And I am not totally comfortable with STIR but never mind.
My one objection to the Saturday Times is that it often uses what I could would call "obscure" words as solutions, such as ONLINER, which I have no doubt is an acceptable word (took me a while to fathom this one) and IVIED which is a word I doubt I have ever used. Still, I guess that is all part and parcel of crossword puzzles. I certainly prefer a challenge to one that is easy.