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Top corner proving difficult!
1a very certain to follow seaman mostly in charge (8)
D-G-----
9a Warning to airmen - medal about to be snatched in an instant(8) W-------
20a Tolerate poet's dismissing book quality measures(9) S-A-D---S
3d Test quality of a shilling, for example(5) ----Y
4d Acting a little, one time inhabiting fast mover(2,9)
--?--A-A-T--

Thank you for any help!

20 Standards (measures). It's ''stand' and '(b)ards'.

stand ards

3 Assay - a s(hilling) say.

1a DOGMATIC ?

4d in character ?

9a windsock