Biblical swine are eager and wild (8)
I believe the answer is:
gadarene
'biblical swine' is the definition.
'gadarene' can be an answer for 'swine' (I've seen this before). I am unsure of the 'biblical' bit.
'eager and wild' is the wordplay.
'wild' indicates an anagram.
'eager'+'and'='eagerand'
'eagerand' anagrammed gives 'GADARENE'.
'are' acts as a link.
Can you help me to learn more?
(Other definitions for gadarene that I've seen before include "The - swine rushed into the sea (Bible)" , "Rushing disastrously" , "Suicidal animals (in the Bible)?" , "Rushing headlong, like the Biblical swine" , "Biblical swine that ran into sea possessed by devils" .)