Hi Lumen,
The 3rd 10 is an an anagram similar to the other first 10 in that it's 2 words + 2 single letters (it's a foreign term, French I think but both words are known) - definition is "pigment".
Last 10 - First 2 letters are as you say + 2 letter "when" + 6 letter "put to seas" - definition is "free from attacks" but don't be confused by the apparent tense of the definition.
NB, In an earlier post I inadvertently assigned a number to an answer - I didn't have the puzzle in front of me and so visualised it from memory, completely forgetting that there are no clue numbers, As such, I've emailed Norah and asked her to remove the post.
Apologies to everyone, it was a genuine oversight and I hope it hasn't spoiled anyone's fun.