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4d Severe test for footless invalid (6,2,7)
-S-E--, -F, -V-R-S- Assume it's ASCENT OF EVEREST, but not sure why.
12a Tendency to cover same ground in rock formation (8) -A-E-E-- If 4d is correct, the last letter is T
Thanks.

1st is Anagram
2nd is Basement

Whoops - a bit hasty,not an anagram.

Thanks

think it must be to do with ASCENT, and SEVERE

EVEREST footless = EVERES
EVERES invalid(anagramed) = Severe.
But im none too convinced by that explanation!