Bird appearing in banner headline (4)
I believe the answer is:
rhea
'bird' is the definition.
(rhea is a kind of bird)
'in banner headline' is the wordplay.
'in' indicates the answer is hidden within the clue.
'RHEA' is hidden in the letters of 'banner headline'.
'appearing' acts as a link.
(Other definitions for rhea that I've seen before include "nonflyer" , "Fast runner" , "China grass" , "South American bird resembling the ostrich" , "Greek goddess of fertility - running bird" .)