Team removing lead supporter by choice (7)
I believe the answer is:
ideally
'team removing lead' is the definition.
I can't judge whether this definition defines the answer.
'supporter by choice' is the wordplay.
'supporter' becomes 'ally' (an ally is a friend or supporter).
'by' is a charade indicator (letters next to each other).
'choice' becomes 'ide' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ally' after 'ide' is 'IDEALLY'.
Can you help me to learn more?
(Other definitions for ideally that I've seen before include "In the best possible scenario" , "In the most perfect way" , "Perfectly; most suitably" , "in optimal way" , "In a perfect world, the best possible situation" .)