DT �500 prize xword

[chokkie]

Can someone help with the last few clues, please:
11d. Scottish comedian: t---e-e
65a. causing anxiety (5,6): nerve ---ping
77a ornamental stone: (5) a----
66d: alveolus (3,3) --r, ---
54d: behave affectedly in oder to impress (4); -o-e
74d musical note (5): b---o

Thanks in advance, folks

[roslyn251254]

66d air sac
74d breve

[JUNKMAN]

77a agate
66d air sac
54d pose
74d could be breve if o is wrong

[ianmunt]

11d Corbett,9a archaic 26a stilt

[Beatrice35]

Is 65 Across) Nerve Sapping? Tal vez- perhaps? Ciao, Bea

[ellenherlyn]

65a: nerve-racking
66d: air sac
74d: breve
77a: agate
54d: pose
Cannot find the Scottish comedian: T---e-e or T---e-t if
the wading bird is stilt, not snipe

[ladyalex]

Wading bird is STILT as ianmunt said, across word is ARCHAIC giving a 'C' for teh starting letter of CORBETT for scottish comedian.
Hope this helps.
:-))