Joke suitable for all by a Biblical character (6)
I believe the answer is:
joshua
'biblical character' is the definition.
(I've seen this before)
'joke suitable for all by a' is the wordplay.
'joke' becomes 'josh'.
'suitable for all' becomes 'u' (short for Universal film certificate).
'by' says to put letters next to each other.
'josh'+'u'+'a'='JOSHUA'
(Other definitions for joshua that I've seen before include "Fighter at Jericho" , "Judges found next to this" , "Moses's successor, victor of the Battle of Jericho" , "The -- Tree, U2 album; successor to Moses" , "He succeeded Moses and fought the battle of Jericho" .)