Contents of pouch swallowed by brown bird? (6)
I believe the answer is:
toucan
'bird?' is the definition.
(toucan is a kind of bird)
'contents of pouch swallowed by brown' is the wordplay.
'contents of' means to look at the middle letters (letters inside the word).
'swallowed by' is an insertion indicator.
'brown' becomes 'tan' (tan is a kind of brown).
The central letters of 'pouch' are 'ouc'.
'ouc' put inside 'tan' is 'TOUCAN'.
(Other definitions for toucan that I've seen before include "Bird with large colourful beak" , "Bird with a large brightly-coloured bill" , "Fruit-eating bird" , "Sounds as if a pair is able for the tropical bird" , "Bird with large, colourful bill" .)