A potion for men? It's possibly a disputable point (6,2,7)

I believe the answer is:

matter of opinion

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'a disputable point' is the definition.
The definition suggests a singular noun which matches the answer.

'a potion for men? it's possibly' is the wordplay.
'possibly' indicates anagramming the letters.
'a'+'potion'+'for'+'men'+'it'='apotionformenit'
'apotionformenit' anagrammed gives 'MATTER OF OPINION'.

Can you help me to learn more?

(Another definition for matter of opinion that I've seen is " It depends on your taste".)

I've seen this clue in The Daily Express.

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