After starters of really excellent duck medallions, have lamb, perhaps (3,4)
I believe the answer is:
red meat
'lamb perhaps' is the definition.
(I've seen this before)
'after starters of really excellent duck medallions have' is the wordplay.
'after' means one lot of letters go next to another.
'starters of' says to take the initial letters.
'have' becomes 'eat' (have can mean to eat or consume).
The first letters of 'really excellent duck medallions' is 'redm'.
'redm' next to 'eat' is 'RED MEAT'.
(Other definitions for red meat that I've seen before include "beef, say?" , "Beef e.g." , "Beef, lamb or mutton before cooking" , "Soak up" , "beef, perhaps" .)