I have done most of the gridbut some clues remain.
15d. Beginners tackling slope? Probably not them (9)
36a. Retrospective part of joing composition (5)
33d. Stealhorse tipped to win (3)
I have filled in the cells on top and bottom rows and found similar cells in 3 rows of the grid.
I also have the Poet. I am assuming the subject is H?? M???????.
Lines begin Licence... and Before.....