Extravagant old gentleman sent back dish (7)
I believe the answer is:
risotto
'dish' is the definition.
(risotto is a kind of dish)
'extravagant old gentleman sent back' is the wordplay.
'extravagant' becomes 'ott' (I've seen this in other clues).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'gentleman' becomes 'sir' (I've seen this before).
'sent back' shows that the letters should be reversed in order.
'ott'+'o'+'sir'='ottosir'
'ottosir' written backwards gives 'RISOTTO'.
(Other definitions for risotto that I've seen before include "F" , "Savoury rice dish" , "dishy thing!" , "It has roots in Italian rice-based dish" , "Italian food" .)