Being in neutral territory will make all the difference (5)
I believe the answer is:
alter
'all the difference' is the definition.
I can't judge whether this definition defines the answer.
'being in neutral territory will' is the wordplay.
'being in' says the answer is hidden in the clue.
'ALTER' is hidden within 'neutral territory will'.
'make' acts as a link.
Can you help me to learn more?
(Other definitions for alter that I've seen before include "Bout of extravagant spending" , "Alert to change" , "Vary" , "Make changes to" , "Adapt" .)