Bird chewed a pencil (7)
I believe the answer is:
pelican
'bird' is the definition.
(pelican is a kind of bird)
'chewed a pencil' is the wordplay.
'chewed' indicates an anagram.
'a'+'pencil'='apencil'
'apencil' anagrammed gives 'PELICAN'.
(Other definitions for pelican that I've seen before include "Bird's" , "Seabird having a large bill with a pouch for fish" , "The large bird is in place" , "Long-billed aquatic bird" , "Large bird with enormous beak" .)