Potentially shocking railway employees' uniforms (6)

I believe the answer is:

livery

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

'potentially shocking railway employees' uniforms' is the definition.
I can't tell whether this definition defines the answer.

'potentially shocking railway' is the wordplay.
'potentially shocking' becomes 'live' (I can't explain this - if you can you should give a lot more credence to this answer).
'railway' becomes 'ry' (abbreviation).
'live'+'ry'='LIVERY'

Can you help me to learn more?

(Other definitions for livery that I've seen before include "Uniform, eg of guild" , "Feeding and stabling of horses for money" , "Horse maintenance" , "The care of horses for pay" , "group of servants" .)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.