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Last one. 26ac (4). Did trainee librarian have to learn this nonsense? I've got T-S-. TOSH meets the definition, but if so, what's the word-play? It's probably quite simple (but that seems to be an appropriate description of me in this context).
Could someone please gently explain it to me?

To Shhh.. Be Quiet!

Many thanks, Brendan. So simple, but so elusive.
The arms of Morpheus now beckon, so goodnight!