Sorry, I've googled all the lists of shells I can find, and nothing will fit!
Perhaps the missing first letter for the window?
I'm assuming it's not "arret", which is not even in my French dict. in that sense!
Thank you Jazzgirl It has taken me the whole afternoon to complete this crossword, I think that I shall have to invest in the RT if this is the quality of their crosswords. Once again many thanks
Thanx, oldyalan: I knew it under its French name "ormeau", tho' I don't remember that I've ever eaten one -- they're supposed to be delicious, I see........................