Vain thugs regularly struck Christian martyr (5)

I believe the answer is:
vitus
'struck christian martyr' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'vain thugs regularly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'vain'+'thugs'='vainthugs'
The alternate letters of 'vainthugs' are 'VITUS'.
Can you help me to learn more?
(Other definitions for vitus that I've seen before include "Saint whose dance is a disease" , "Saint giving name to "dance"" , "Saint (with a pathological dance)" .)
