Songbird with streaky brown plumage (5)
I believe the answer is:
pipit
'songbird with streaky brown plumage' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for pipit that I've seen before include "Songbird with streaky brown plumage" , "Singer" , "Songbird of open country" , "Bird of meadow, tree, or rock" , "Bird related to wagtail" .)