Crossword Genius

500 or so confused entrances (5)

Ross

I believe the answer is:

doors

'entrances' is the definition.
(door is a kind of entrance)

'500 or so confused' is the wordplay.
'500' becomes 'd' ('d' can be a synonym of '500').
'confused' indicates anagramming the letters.
'or'+'so'='orso'
'orso' anagrammed gives 'oors'.
'd'+'oors'='DOORS'

(Other definitions for doors that I've seen before include "Portals" , "Swinging or sliding barriers" , "Openings" , "Barriers to entrances" , "Ways in and out" .)

I've seen this clue in The Mirror.
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