Possibly powerful with one friend (11)

I believe the answer is:

potentially

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'possibly' is the definition.
Both the definition and answer are adverbs. Maybe you can see a link between them that I can't see?

'powerful with one friend' is the wordplay.
'powerful' becomes 'potent' (similar in meaning).
'with' means one lot of letters go next to another.
'one' becomes 'I' (Roman numeral).
'friend' becomes 'ally' (an ally is a friend or supporter).
'potent'+'i'+'ally'='POTENTIALLY'

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I've seen this clue in The Mirror.

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