cryptic 199

Hi

I just cannot get the last few on this!!!

51a - building site supervisors form a barbershop quartet, by the sound of it - ???e?e?
3d - one who puts their stamp on correspondence - s?n?e?
28d - tyrannises newspapers in awkward pose - ?p?r?s?e?
52d - go north after raw metal or wood - ??e?o?
59d - speaker hides in ship from fans who follow him everywhere -
?t???e?s

Thanks in advance