sorry, pyret, i don't really understand your reply.
if you're happy with crossword compiler, just export a pdf from there, which you can then import into scribus.
you can export also to rtf (iirc) and import it into a text frame to get the definition in a text frame (if you have defintions).
all in all, in scribus it's rather easy to create a grid by using the multiple duplication tool or by writing a python script.
but scribus does not have a tool that will create a grid for you.