A number tucked into a bird in the inn (6)
I believe the answer is:
tavern
'the inn' is the definition.
(I've seen this before)
'a number tucked into a bird in' is the wordplay.
'number' becomes 'V' (V is an example).
'tucked into' means one lot of letters goes inside another.
'a bird in' becomes 'tern' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'v'='av'
'av' inserted inside 'tern' is 'TAVERN'.
Can you help me to learn more?
(Other definitions for tavern that I've seen before include "Watering hole" , "An old inn, musically in the town" , "An old inn or public house" , "drinking establishment" , "Tap-house" .)