Rex makes a fish dish (7)

I believe the answer is:

rissole

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'dish' is the definition.
(rissole is a kind of dish)

'rex makes a fish' is the wordplay.
'rex makes' becomes 'ris' (I can't justify this - if you can you should believe this answer much more).
'a fish' becomes 'sole' (sole is a kind of fish).
'ris'+'sole'='RISSOLE'

Can you help me to learn more?

(Other definitions for rissole that I've seen before include "Compressed meat and spices in breadcrumbs, fried" , "Fried ball of minced food" , "faggot" , "Lorises (anag)" , "Small cake of deep-fried minced meat" .)

I've seen this clue in The Daily Express.

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