Question Author
Thank you to Captain2 for resolving Queries 1 & 3 so promptly. But a particular thank you to Spoffy for your very precise and logical analysis of my problem with Query 2. It seems spot-on to me.
Tim Moorey is a very respected compiler by many, including myself, but the/his proof reading function for The Week crossword is, not infrequently, very imperfect - which is a shame as it could be perfect without a great deal of extra work.
I fully understand that "model" is often an anagram indicator, and that he may have had a moment's forgetfulness when compiling the clue but, Spoffy, can you find as lucid an explanation for the other clue back in May (also misusing the word "model") that I referred to in my original post. Too boring possibly, and you might suggest I ask Tim Moorey himself - which I have been reluctant to do before now.