Bird is calm, eating baked bread (9)
I believe the answer is:
redbreast
'bird' is the definition.
(redbreast is a kind of bird)
'calm eating baked bread' is the wordplay.
'calm' becomes 'rest' (I've seen this before).
'eating' means one lot of letters goes inside another.
'baked' indicates anagramming the letters.
'bread' is an anagram of 'dbrea'.
'rest' placed around 'dbrea' is 'REDBREAST'.
'is' acts as a link.
(Other definitions for redbreast that I've seen before include "Type of robin" , "One tweets" , "Bird" , "Flapper" .)