Winger heading for goal, getting on top (9)
I believe the answer is:
goldcrest
'winger' is the definition.
(goldcrest is a kind of bird)
'heading for goal getting on top' is the wordplay.
'heading for' says to take the initial letters.
'getting on' becomes 'old' ('getting on a bit' means 'old').
'top' becomes 'crest' ('crest' can be a synonym of 'top'**).
The first letter of 'goal' is 'g'.
'g'+'old'+'crest'='GOLDCREST'
(Other definitions for goldcrest that I've seen before include "Winger" , "One maybe visiting garden" , "Britain's smallest bird" , "Little bird" , "Very small bird" .)