Bird chewed tasty morsel (6)
I believe the answer is:
titbit
'tasty morsel' is the definition.
(I've seen this before)
'bird chewed' is the wordplay.
'bird' becomes 'tit' (tit is a kind of bird).
'chewed' becomes 'bit'.
'tit'+'bit'='TITBIT'
(Other definitions for titbit that I've seen before include "Pleasing scrap of gossip" , "Small item of tasty food" , "Choice bit of something, food or gossip" , "Dainty morsel" , "tiny amount of food" .)