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Stuck on a few of them
25a Flawed Spanish composer arranged no music lacking intros (10) ?A?L???O?S. MAELSTROMS ???
46a Dominatrix, perhaps,takes on one short and cheeky lad (14) ?H?P?E?U?A?T?R
18d Muscle is able to initially correct youth's fault (8)
?E????N?You
42a Rivendell's lord transporting parts for poem (6)
?O?D?L
Thinking it's to do with lords of the ring ??

46a. Whippersnapper

Cannot help with others I'm afraid

46 Whippersnapper, shrot and cheeky lad.
43 Rondel, poem

25 Fallacious, false (Falla +(m)usic +o).

18 Peccancy, fault. Pec, muscle +Can + C(an) Y(outh).

Thanks to you both, would never have got the answers myself.
Have a good day

Just realized I had 43d wrong , silly me it's username, less wine tonight..