I'm stumped with this one too. I assume it's the same crossword with Plectrum, Boer and Weasel as your down clues giving you the L, O and E. My only thought was a variation on the spelling of sluice but I can't find one !!!
Yep Magyar it's the same x word
I'm like you i've tried everything I can think of for sluice with no luck does any-one know of an alternative for:-
Dutch settler in Sth Africa(4)
Boer gives the O as Magyar says