Some bread for a swan (3)
I believe the answer is:
cob
This clue is a double definition.
'some bread' is the first definition.
(I've seen this in other clues)
'for a swan' is the second definition.
(cob is a kind of swan)
(Other definitions for cob that I've seen before include "mixture of clay and straw" , "Source of bread" , "Swan of Jacobean origin" , "A loaf; a nut; a horse" , "Round loaf of bread" .)