Glamour of biker escaping blitzkrieg, somehow (5)
I believe the answer is:
glitz
'glamour' is the definition.
(both can mean splendour or extravagance)
'biker escaping blitzkrieg somehow' is the wordplay.
'escaping' is a deletion indicator.
'somehow' indicates anagramming the letters.
'blitzkrieg' with 'biker' removed is 'ltzig'.
'ltzig' anagrammed gives 'GLITZ'.
'of' is the link.
(Other definitions for glitz that I've seen before include "Extravagant superficial display (colloq.)" , "Showiness" , "Garishness" .)