Current affairs footage of eels, wren, cuckoo (8)
I believe the answer is:
newsreel
'current affairs footage' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'eels wren cuckoo' is the wordplay.
'cuckoo' is an anagram indicator.
'eels'+'wren'='eelswren'
'eelswren' anagrammed gives 'NEWSREEL'.
'of' is the link.
Can you help me to learn more?
(Other definitions for newsreel that I've seen before include "Cinema broadcast" , "Old film about current events" , "Film report" , "information screened" , "Short film of current events" .)