A patron. In the Church of England, the one who gets to give the prospective incumbent the once over and decide whether or not to present them to the Bishop. Or today, one who patronises.
I don’t know what it is about the sight of a lone fairly middle-aged woman eating lunch that impels people to come and sit next to her. It might be friendliness, kindness, a desire to be neighbourly. Let’s assume so. When you ask her what she’s doing in the college, if she replies “Hiding in the library with some books”, it’s a fair bet she’s studying. So try not replying “Self guided reading? Marvellous!”
When she politely (if surprisingly tersely) asks, “And you?”, my recommendation is that you don’t explain the basic management technique you have just been taught, because you never know, she might hold a Masters in Business Administration, and be way ahead of you on that front. Equally, try not to add how useful the technique will be in managing ‘you lovely people in congregations’, because she isn’t in your congregation. The noise you can hear is her grinding her teeth. And when she asks a rather detailed question about the finer point of applying what you have just been talking about in your parishes, beware. She might listen carefully to your answer, then gently, clearly, and inexorably, give you a case study from her “secular career”.
If you then raise your eyebrows, and enquire if she is an NSM, be prepared for the possibility that she is a full time incumbent, currently studying for her doctorate, which she thinks will be a useful addition to her first and second degrees. When she politely explains this, try not to make a noise like a strangled cat.
Of course, you don’t need to worry, because you never make assumptions. Do you?