Liquid lunch perhaps very revolting (4)
I believe the answer is:
soup
'liquid lunch perhaps' is the definition.
(I've seen this in another clue)
'very revolting' is the wordplay.
'very' becomes 'so' (both can mean 'extremely').
'revolting' becomes 'up' (I've seen this in other clues).
'so'+'up'='SOUP'
(Other definitions for soup that I've seen before include "Mulligatawny or borscht?" , "Preliminary course" , "Eg, minestrone" , "Stolen plate melted down" , "First course" .)