Brief corporation on railroad, maybe, that’s to go round Jersey? (7)
I believe the answer is:
cowbell
'that's to go round jersey?' is the definition.
(Jersey is a breed of cow)
'brief corporation on railroad maybe' is the wordplay.
'brief' means to remove the last letter.
'corporation' becomes 'belly' (synonyms).
'on' is a charade indicator (letters next to each other).
'railroad maybe' becomes 'cow' (both can mean to intimidate).
'belly' with its last letter removed is 'bell'.
'bell' after 'cow' is 'COWBELL'.
(Other definitions for cowbell that I've seen before include "produced neat chime" , "Percussion instrument" , "It's heard among Alpine herds" , "alarm for rural use?" .)