Gallivanting more a job for a Biblical king (8)
I believe the answer is:
jeroboam
'a biblical king' is the definition.
'gallivanting more a job' is the wordplay.
'gallivanting' indicates anagramming the letters (letters move or gallivant around).
'more'+'a'+'job'='moreajob'
'moreajob' with letters rearranged gives 'JEROBOAM'.
'for' acts as a link.
(Other definitions for jeroboam that I've seen before include "Very large wine bottle named after old king of Israel" , "'Large wine bottle, equal to four standard ones (8)'" , "Large bottle of champagne; a Rome job (anag.)" , "Four-times bottle size" , "Very large wine bottle named after Israeli king" .)