Fish in newspaper served up (3)
I believe the answer is:
gar
'fish' is the definition.
(gar is a kind of fish)
'newspaper served up' is the wordplay.
'newspaper' becomes 'rag' (rag is a kind of newspaper).
'served up' is a reversal indicator.
'rag' reversed gives 'GAR'.
'in' acts as a link.
(Other definitions for gar that I've seen before include "Pike-like fish" , "A fish; cloth scrap (reversed)" , "swimmer" , "something fishy here" , "Creature" .)