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Finished,but can someone explain 20 d to the (I suspect)film-uninitiated old me?Only scanty references in Net,largely inaccessible without joining up somewhere...(I'm talking Solwyn,by the way).Thanx in advance!

ONLY + W (with) + S (south/direction)

Scrub my answer - I hadn't read the clue properly.

I think the answer is selsyn (a type of transformer) - Selwyn College with w replaced with s.

Very belated thanks:must look up selsyn online,not in my old dictionaries!