At last, Manchester United revived (7)
I believe the answer is:
rallied
'revived' is the definition.
(I've seen this in another clue)
'at last manchester united' is the wordplay.
'at last' says to take the final letters.
'united' becomes 'allied' (similar in meaning).
The last letter of 'manchester' is 'r'.
'r'+'allied'='RALLIED'
(Other definitions for rallied that I've seen before include "Brought together" , "Assembled in a mass meeting" , "(Of shares) increased in value after a fall" , "Got better" , "Met together for cause" .)