Thanks to son1ofrover1, for your query @ 42 and to midgers for your reply @ 43; this confirmed my interpretation of the first word in the phrase. I can stop trawling through the posts now and heave a sigh of satisfaction!
Thanks also to Seps for this tour de force of construction — for me, the quotation always brings to mind Jasper Carrott's question ‘Why do I always get the nutter?’!
[If you're in the “struggling and about to give up” camp, all I can say is “When the going gets tough, remember the words of 21a…’]