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rte 10across Blah-blah.(8)?h?t?i?e or ?h?o?i?e(theorise)??? ALL DEPENDS ON 21 across. Space is filled with unseen shadowy substances. (4,6) ?a?k ?a?o?r dark vapour or matter leaving ?h?t?i?e for 10 across.

dark matter looks good. space as in universe,etc.
this coluld give you chatline for the other one.

thanks terry. so obvious now. there,s even a line drawn after the clue. this ismy last one. many thanks. gee i feel so silly