Regalia from electrified railway (6)
I believe the answer is:
livery
'regalia' is the definition.
(thesaurus)
'electrified railway' is the wordplay.
'electrified' becomes 'live' (I've seen this in another clue).
'railway' becomes 'ry' (abbreviation for railway).
'live'+'ry'='LIVERY'
'from' acts as a link.
(Other definitions for livery that I've seen before include "Uniform - commercial care of horses" , "Uniform -- suffering from gastric distress" , "The stabling and care of horses" , "Irritable" , "Distinctive uniform once worn by servants of posh people" .)