Bird gets brown with time, right? (7)
I believe the answer is:
tanager
'bird' is the definition.
(tanager is a kind of bird)
'brown with time right?' is the wordplay.
'brown' becomes 'tan' (tan is a kind of brown).
'with' means one lot of letters go next to another.
'time' becomes 'age' (an age is a period of time).
'right?' becomes 'r' (abbreviation).
'tan'+'age'+'r'='TANAGER'
'gets' is the link.
(Other definitions for tanager that I've seen before include "Songbird of the bunting family" , "South American singer" , "A bird" , "American songbird" .)