Send back for example, a first soup (6)
I believe the answer is:
potage
'soup' is the definition.
(potage is a kind of soup)
'send back for example a first' is the wordplay.
'send back' says the letters should be written backwards.
'for example' becomes 'eg' ('e.g.' can be a synonym of 'for example').
'first' becomes 'top' ('top' can be a synonym of 'first'**).
'eg'+'a'+'top'='egatop'
'egatop' backwards is 'POTAGE'.
(Other definitions for potage that I've seen before include "this spoon-fed?" , "Thick, often creamy soup" , "> sort of liquid nourishment" , "French soup, usually thick" , "that's thick" .)