Crossword Genius

Like big dark space with a cover, sun being obscured (9)

Ross

I believe the answer is:

cavernous

'like big dark space' is the definition.
(like a cavern)

'a cover sun being obscured' is the wordplay.
'being obscured' indicates anagramming the letters (I've seen 'obscure' mean this).
'a'+'cover'+'sun'='acoversun'
'acoversun' with letters rearranged gives 'CAVERNOUS'.

'with' is the link.

(Other definitions for cavernous that I've seen before include "Roomy" , "Gaping" , "like a big pit" , "of large underground chambers" .)

I've seen this clue in The Times.
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