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11Dn(4)
no lettersIntrepid , adventurous naval officer has by- road (a short one) named after him

1Dn (6)
no letters
Constant speed maintained by raider on board

3Dn (5)
???? March????
Char eats head of minnow, which will spread stain ?

4Dn (7)
No letters
At the beginnings of Elgar's Nocturne (String) might a couple do the twist

Char eats head of minnow, which will spread stain ?

sMear

t the beginnings of Elgar's Nocturne (String) might a couple do the twist

EN-twine

Constant speed maintained by raider on board

pi-rate

10 pirate (raider on board) ?
PI (Constant) + Rate (speed) ?

sorry, my internet is running very slow.

Thank you
Very grateful to you all

The first one is BYRD

BY with short road (RD)

Rear Admiral Richard Evelyn Byrd, Jr., USN (25 October 1888 – 11 March 1957) was an American naval officer who specialized in feats of exploration

Thank you
Would not have got the clue