Crossword Genius

Former star to boycott part of course (5,4)

Ross

I believe the answer is:

black hole

'former star' is the definition.
(a black hole is formed by a collapsing star)

'boycott part of course' is the wordplay.
'boycott' becomes 'black' (black can mean to refuse to handle certain goods).
'part of course' becomes 'hole' (hole on a golf course).
'black'+'hole'='BLACK HOLE'

'to' acts as a link.

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

I've seen this clue in The Guardian.
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