A line of taxis? (4)
I believe the answer is:
axis
'a line' is the definition.
(axis is a kind of line)
'taxis?' is the wordplay.
'AXIS' is hidden in amongst the letters.
But, I am not sure how this is indicated.
'of' is the link.
Can you help me to learn more?
(Other definitions for axis that I've seen before include "Centre about which something turns" , "1936 alliance between Germany and Italy" , "Line from N. to S. Pole" , "Imaginary central line" , "World War two Italy-Germany alliance" .)