last few and totally stuck
19a: Duke leaving bird in launch again (7)
R???A?T
33a: Centre of American expansion? (5,6)
R???E/???A?D
51a: Short article about mummy for Muslim leader's office (7)
I?A?A?E
20d: supporter on board gets job with firm (9)
??A?N???T
29d: Obligatory pointer left out on top of desk (6)
?E?D?D
25d: One barely visible in colony (6)
M?D???
Would love some answers.