Bird to smoke at home (6)
I believe the answer is:
puffin
'bird' is the definition.
(puffin is a kind of bird)
'smoke at home' is the wordplay.
'smoke' becomes 'puff' (puffing is a kind of smoking).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'puff'+'in'='PUFFIN'
'to' acts as a link.
(Other definitions for puffin that I've seen before include "Bright-billed auk" , "Seabird with brightly coloured bill - sounds out of breath" , "Seabird with a colourful bill" , "Bird with large beak" , "Bird with colourful beak" .)