Crossword Genius

Reference line (4)

Ross

I believe the answer is:

axis

'reference line' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for axis that I've seen before include "Spindle - German/Italian alliance - deer" , "coalition" , "1936 alliance between Germany and Italy" , "Fixed line in revolution" , "Fixed reference line" .)

I've seen this clue in The Telegraph and The Independent.
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