Radio Times Prize Crossword 21

[elizabethsarah]

Impressed by how fast I nearly completed this one but now completely stuck on last few clues. Can anyone help?
6a - instrument once in a laundry -? E?H?O???
10a - begin over small American prison -? O?N
23a -bird sound made by Dr No? -?U???
3d - opera character has noisy meeting with knight -??? S?A?
4d - amount of herring (1000) missed by oddball -? R?N
21d - smooth, unopened light coat - L???

[scorpiojo]

6 washboard
10 O pen
23 quack
4d cran(k)
21 (s)lick

[scorpiojo]

3d Seen as Tristan

[elizabethsarah]

Thanks Scorpio jobs. Just cracked washboard and open before your reply but good one for help with the others though not sure what cran means?!

[scorpiojo]

Cran is a measure of herring
Crank = oddball

[scorpiojo]

http://www.oxforddictionaries.com/definition/english/cran

[elizabethsarah]

3d Trist (as in sounds like tryst - meeting) and a n for a night. I would never have worked that one out! Thank you :)

[scorpiojo]

You're welcome :)

[elizabethsarah]

And now I have learnt something about herring I never knew before

[scorpiojo]

:o)