Collapsed star site (5,4)

I believe the answer is:

black hole

(Other definitions for black hole that I've seen before include "Space left after collapse of a star" , "Astronomical curiosity" , "object in 21 [SPACE] having very strong 20 [GRAVITY]" , "discovered in Calcutta" , "'Region of space from which nothing can escape (5,4)'" .)

I've seen this clue in The Sun.

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