Crossword Genius

This column backs one up (6)

Ross

I believe the answer is:

spinal

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for spinal that I've seen before include "Type of column" , "sort of column" , "like a column in body" , "Member of dock family with edible stems" , "affecting the back?" .)

I've seen this clue in The Irish News and The Globe and Mail.
Want a hint initially instead of a full solution? Install my app