Shock after submarine finds preserved fish (7)
I believe the answer is:
rollmop
'preserved fish' is the definition.
'rollmop' can be an answer for 'fish' (type of herring fillet). I'm not sure about the 'preserved' bit.
'shock after submarine' is the wordplay.
'shock' becomes 'mop' (I've seen this before).
'after' says to put letters next to each other.
'submarine' becomes 'roll' (submarine is a type of sandwich or roll).
'mop' put after 'roll' is 'ROLLMOP'.
'finds' acts as a link.
Can you help me to learn more?
(Other definitions for rollmop that I've seen before include "Dish of herring fillet" , "savoury dish" , "Curled-up herring fillet" , "Fish" , "Food" .)