I serve differently to conclude Federer's final game (7)
I believe the answer is:
reversi
'game' is the definition.
(I've seen this before)
'i serve differently to conclude' is the wordplay.
'differently' indicates anagramming the letters.
'to' says to put letters next to each other (I've seen this in other clues).
'conclude' becomes 'r' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'i'+'serve'='iserve'
'iserve' anagrammed gives 'eversi'.
'eversi' put after 'r' is 'REVERSI'.
'federer's final' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for reversi that I've seen before include "Game in which captured pieces are inverted" , "Game involving turning over captured pieces" .)