I have three mysterious clues:-
11 Down - "Stone proficient fop dropped off" )7) C--R--E
(The only stone I can think of is "CUPRITE" but, then
again, "RAKE" for fop may feature somewhere!)
19 Down:- "Animal leaps back perfectly" (5) S-O--
(The "S" will probably represent the last letter of
"LEAPS" but I can't figure out the rest! If the answer
is an animal, then I can only think of "SLOTH" or
"STOAT")
26 Across:- "Saying "now, now," guard left" (7) -T---N-
( I can only think of "STATING" as the answer, the
"G" being the left hand letter of "GUARD")