Plant serving sauce with meat (5)
I believe the answer is:
oxlip
'plant' is the definition.
(oxlip is a kind of plant)
'sauce with meat' is the wordplay.
'sauce' becomes 'lip' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'meat' becomes 'ox' (ox is a type of meat).
'lip' after 'ox' is 'OXLIP'.
'serving' is the link.
(Other definitions for oxlip that I've seen before include "Primrose-cowslip hybrid" , "Eurasian primrose with yellow flowers" , "Woodland flower" , "Flower of the primrose family" , "Primula with yellow hanging flowers" .)