Bring up clip, difficult to understand, showing fish (8)
I believe the answer is:
pilchard
'fish' is the definition.
(I know that pilchard is a type of clupeid)
'bring up clip difficult to understand' is the wordplay.
'bring up' is a reversal indicator.
'difficult to understand' becomes 'hard' (hard can mean difficult to understand or obscure).
'clip' written backwards gives 'pilc'.
'pilc'+'hard'='PILCHARD'
'showing' is the link.
(Other definitions for pilchard that I've seen before include "Fish of herring family" , "Small sea fish related to the herring" , "'Small fatty fish, usually canned (8)'" , "Small fatty fish, usually tinned" , "type of fish" .)