Dumplings in grand do served up, most elegant (7)
I believe the answer is:
gnocchi
'dumplings' is the definition.
(I've seen this before)
'grand do served up most elegant' is the wordplay.
'grand' becomes 'G' (G is short for ground as in a thousand).
'do' becomes 'con' (both can mean to defraud).
'served up' is a reversal indicator.
'most' means to remove the last letter.
'elegant' becomes 'chic' (I've seen this before).
'con' in reverse letter order is 'noc'.
'chic' with its last letter removed is 'chi'.
'g'+'noc'+'chi'='GNOCCHI'
'in' acts as a link.
(Other definitions for gnocchi that I've seen before include "Starchy food" , "Italian food" , "A course in Rome" , "2 [PASTA]" , "Italian dish" .)