Biblical victim said to be competent (4)
I believe the answer is:
able
'be competent' is the definition.
(similar in meaning)
'biblical victim said' is the wordplay.
'biblical victim' becomes 'abel' (I've seen this in another clue).
'said' indicates a 'sounds like' (homophone) clue.
'abel' sounds like 'ABLE'.
'to' is the link.
(Other definitions for able that I've seen before include "Having considerable skill" , "Capable seaman" , "Qualified - expert" , "Well-equipped" , "Clever skilful" .)