Crossword Genius

Cipher Joby made to shift alphabetically (4)

Ross

I believe the answer is:

zero

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

'cipher' is the definition.
(I know that cipher can be written as zero)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for zero that I've seen before include "Duck" , "Very bad visibility" , "Less than one" , "The hour to leave" , "value?" .)

I've seen this clue in The Sunday Times and The Times.
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