PAMCC. I've just read your latest words but still maintain that, under a RIS, you can be given instructions.
Hope this is not too long-winded, but from descending through FL245 until landing from an ILS last week I was under a RIS throughout. I was asked to descend to various FLs, turn onto various hdgs, set QFE, descend to a height, do some checks, tell him when I was established on the localiser and then that I was on the g-slope with the gear. It was then that talkdown cleared me to land - still under a RIS. During this recovery I had one call albout another ac, but the majority of the R/T calls were instructions from ATC which I acknowledged before executing.
I don't think I'm being too pedantic here, but surley this amounts to being 'cleared' to follow each instruction, albeit I didn't ever have to.
H Peacock