Final stage managed somehow, Australia slips away while England is in front (7)
I believe the answer is:
endgame
'managed somehow australia slips away while england is in front' is the definition.
I can't judge whether this defines the answer.
'final stage' is the wordplay.
'final' becomes 'end' (synonyms).
'stage' becomes 'game' (I can't explain this - if you can you should give a lot more credence to this answer).
'end'+'game'='ENDGAME'
Can you help me to learn more?
(Other definitions for endgame that I've seen before include "Closing chess moves" , "final moves" , "contest's final stage" , "when there are few men left" , "close to board meeting" .)