Crossword Genius

Reference line (4)

Ross

I believe the answer is:

axis

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reference line</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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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