Bird permit includes pub (6)
I believe the answer is:
linnet
'bird' is the definition.
(linnet is a kind of bird)
'permit includes pub' is the wordplay.
'permit' becomes 'let' ('let' can be a synonym of 'permit').
'includes' is an insertion indicator.
'pub' becomes 'inn' (I've seen this before).
'let' enclosing 'inn' is 'LINNET'.
(Other definitions for linnet that I've seen before include "Small finch, once popular as a caged songbird" , "Brown-grey kind of finch" , "A singing bird as from Yeats's Innisfree" , "Member of finch family" , "Songbird (to 6 18)" .)