In the Bible, he's linked with a fishing item (5)
I believe the answer is:
herod
'in the bible he's linked with a fishing item' is the definition.
The definition suggests a singular noun which matches the answer.
'he's linked with a fishing item' is the wordplay.
'linked with' says to put letters next to each other.
'a fishing item' becomes 'rod' (I've seen this in another clue).
'he'+'rod'='HEROD'
Can you help me to learn more?
(Other definitions for herod that I've seen before include "Infanticidal king" , "Roman king of Judaea" , "child murderer" , "Ruler of Palestine when Jesus was born" , "NT king" .)