Thanks for the two replies - particularly the second one ! I was thrown off-course by having TUBE instead of TABI. I thought the logic was reasonable by PMcK standards - (inner) tubes are blown/pumped up and tubes are a type of sock.
I also have PEARL, which looks as though it should be PERL 'outside' A. This would be good if PERL was a young sea-trout. Of course, PARR and PEEL are young sea-trout, so maybe we need to combine words when doing leaps of faith !
On a different tack - do you ever tackle the AZED. I completed 1924 last week and have just started 1925. No wonder I sleep well these days...