They may be served with caviar (5)
I believe the answer is:
'they may be served with caviar' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for blini that I've seen before include "Eastern European twenty four Ac" , "Straw hat" , "Russian pancake served with caviar and sour cream" , "Pancakes served with sour cream" , "East European pancakes" .)