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Stuck on the last three, but I think assistance with this one will give me the other two :

53A - Put outside former boundaries of the port, beside hill (11)
E?T???O?I??

It's really too hot to be doing this sort of thing!

Exteriorise

Thanks, Docrum, that is rather what I thought.

However this renders the remaining one well beyond me -
37D - Mendicant offers to conserve rook, and some Aussie species (10)
?R?A?B?R?S

Friarbirds

Mamya, many thanks.

Sadly my "Big Boy's Book of Birds" was lacking this one.