Meat dish and beer fatso ordered (5,4)
I believe the answer is:
roast beef
'meat dish' is the definition.
(type of meal containing meat)
'beer fatso ordered' is the wordplay.
'ordered' is an anagram indicator.
'beer'+'fatso'='beerfatso'
'beerfatso' anagrammed gives 'ROAST-BEEF'.
'and' is the link.
(Other definitions for roast beef that I've seen before include "part of lunch for Sun?" , "Typically 7 down dish" , "Sunday meat?" , "meat dish" , "Joint" .)