Gulp down bird (7)
I believe the answer is:
swallow
I believe this is a triple definition!
'gulp' is the first definition.
(I've seen this before)
'down' is the second definition.
(both can mean to consume or eat)
'bird' is the third definition.
(I know that swallow is a bird)
(Other definitions for swallow that I've seen before include "Creature which can go up" , "See bird" , "Eat - bird - believe" , "Consume - bird!" , "Get down" .)