Manchester United victory, initially getting a flyer? (7)
I believe the answer is:
redwing
'a flyer?' is the definition.
(type of bird)
'manchester united victory initially getting' is the wordplay.
'manchester united' becomes 'red' (Manchester United are called the Red Devils).
'victory' becomes 'win' (a win is a victory).
'initially' suggests taking the first letters.
The first letter of 'getting' is 'g'.
'red'+'win'+'g'='REDWING'
(Other definitions for redwing that I've seen before include "Flyer" , "Migratory thrush" .)