Seem to be on the homestretch now that I've got the author, the poem and the ten words in place, but am still puzzled by a few clues. Thanks for last set of help!
DOWN:
7 Hollow Leo scrunched tissue (6) : ?IP??E ( Thought "NIPPLE" ), BUT THEN
19(A) 19 Drink last short (5) : LATTE seems to cancel this.
41 Fine noise from Alderney institute (4) : ?OOI
33 Welsh river obstructs second unknown creature (6, two words) : M?SKO? ( MUSK OX ) ?
Thanks, Neveracrossword, Fiction-factory and Aelmpvw, I made it over the finishing line, albeit panting, but having learnt a great deal again! Have a wonderful week-end!