Fish and loaves': abridged introduction to miracle (5)
I believe the answer is:
bream
'fish' is the definition.
(bream is a kind of fish)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for bream that I've seen before include "Edible fish" , "Amber (anag) - fish" , "River fish" , "Bar me from the freshwater fish" , "Fish - English guitarist" .)