Desire to be wealthy? Caviare is served (7)
I believe the answer is:
avarice
'desire to be wealthy?' is the definition.
(avarice is extreme greed)
'caviare is served' is the wordplay.
'is served' is an anagram indicator.
'caviare' anagrammed gives 'AVARICE'.
(Other definitions for avarice that I've seen before include "Extreme greed for wealth" , "Greed - caviare (anag)" , "Parsimony" , "Excessive greed for wealth" , "Sway, control" .)