Funny about 15...I recognized the definition part of the clue and wrote in a guess straight off. Only after filling the whole grid did I see a clear thematic (5,3) parsing. Honestly, I skipped over the 1957 bit because the rest fit so well. I just now googled and learned something. š¤£
Bren - Iām certainly not more erudite (or as a receptionist we had used to say, araldite) than you, but Iām glad to have been able to help on this occasion and look forward to you returning the favour soon š
geeker - you have only 7 years on me!
My only real guess first parse later experience was with 9, which I entered before my LOI 17, but which I only parsed fully a few minutes later. I could see the last 5 letters but it took me a relative age to account for the first.