Crossword Genius

Limits certain stars (10)

Ross

I believe the answer is:

boundaries

'limits' is the definition.
('boundary' can be a synonym of 'limit')

'certain stars' is the wordplay.
'certain' becomes 'bound' (as in the phrase 'it's bound to be').
'stars' becomes 'Aries' (constellation).
'bound'+'aries'='BOUNDARIES'

(Other definitions for boundaries that I've seen before include "Limits" , "Borders" .)

I've seen this clue in The Globe and Mail.
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