Whip up fish rolls wrapped in newspaper (6)
I believe the answer is:
foment
'whip up' is the definition.
(I've seen this in another clue)
'fish rolls wrapped in newspaper' is the wordplay.
'fish rolls' becomes 'omen' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'wrapped in' is an insertion indicator.
'newspaper' becomes 'FT' (Financial Times newspaper).
'omen' going into 'ft' is 'FOMENT'.
Can you help me to learn more?
(Other definitions for foment that I've seen before include "Instigate, stir up" , "Arouse or stimulate, maybe trouble" , "Stir up, cause trouble" , "produce a stir" , "Arouse or stimulate, perhaps trouble" .)