Stars in gold rush, endlessly pursuing bit of money (9)
I believe the answer is:
centaurus
'stars' is the definition.
(constellation)
'gold rush endlessly pursuing bit of money' is the wordplay.
'gold' becomes 'au' ('Au' can be a synonym of 'gold').
'endlessly' means to remove the last letter.
'pursuing' means one lot of letters go next to another.
'bit of money' becomes 'cent'.
'au'+'rush'='aurush'
'aurush' with its last letter removed is 'aurus'.
'aurus' after 'cent' is 'CENTAURUS'.
'in' is the link.
(Other definitions for centaurus that I've seen before include "stars" , "Constellation representing a man-horse" .)