Fish from river caught by Ray (5)
I believe the answer is:
bream
'fish' is the definition.
(type of fish)
'river caught by ray' is the wordplay.
'river' becomes 'r' (abbreviation).
'caught by' means one lot of letters goes inside another.
'ray' becomes 'beam' (synonyms).
'r' placed inside 'beam' is 'BREAM'.
'from' acts as a link.
(Other definitions for bream that I've seen before include "Amber kind of fish" , "Bar me from the freshwater fish" , "Carp relative" , "Fish - British classical guitarist, b. 1933" , "River fish" .)