Fish picked up in this paper (3)
I believe the answer is:
rag
'this paper' is the definition.
(rag can mean a newspaper)
'fish picked up' is the wordplay.
'fish' becomes 'gar' (type of gar).
'picked up' says the letters should be written backwards.
'gar' backwards is 'RAG'.
'in' acts as a link.
(Other definitions for rag that I've seen before include "Disreputable newspaper" , "students' excuse to misbehave?" , "Waste piece of cloth" , "A tattered cloth or university frolic" , "Small piece of cloth and university week" .)