Top of dough is first cut to a round plate (4)
I believe the answer is:
disc
'a round plate' is the definition.
(I've seen this before)
'top of dough is first cut' is the wordplay.
'top of' suggests taking the first letters.
'first cut' becomes 'c' (1st letter of 'cut').
The first letter of 'dough' is 'd'.
'd'+'is'+'c'='DISC'
'to' is the link.
(Other definitions for disc that I've seen before include "CD perhaps" , "Layer of cartilege between vertebrae" , "Part of flower" , "Circle" , "put on by jockey?" .)