Crossword Genius

Series of fifty-one points

Ross

I believe the answer is:

line

'series' is the definition.
(line is a kind of series)

'fifty-one points' is the wordplay.
'fifty one' becomes 'LI' (Roman numerals).
'points' becomes 'ne' (North and East).
'li'+'ne'='LINE'

'of' acts as a link.

(Other definitions for line that I've seen before include "Family" , "An American queue" , "Railway track; policy" , "column" , "Long mark; direction" .)

I've seen this clue in the Evening Standard.
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