Little rascal has his heart set on this seafood dish (6)
I believe the answer is:
scampi
'this seafood dish' is the definition.
(I've seen this before)
'little rascal has his heart' is the wordplay.
'little rascal' becomes 'scamp' (both can mean a mischievous person).
'has' says to put letters next to each other.
'heart' says to take the centre.
The middle letter of 'his' is 'i'.
'scamp'+'i'='SCAMPI'
'set on' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for scampi that I've seen before include "Prawn dish" , "Dish of fried shrimps or prawns" , "Norway lobsters -- Dublin Bay prawns" , "Type of seafood" , "Shellfish" .)