Poem on mixing rum is showing discrimination (9)

I believe the answer is:

epicurism

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'discrimination' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'poem on mixing rum is' is the wordplay.
'poem' becomes 'epic' (an epic poem).
'on' means one lot of letters goes inside another.
'mixing' is an anagram indicator.
'rum'+'is'='rumis'
'rumis' anagrammed gives 'urism'.
'epic' inserted into 'urism' is 'EPICURISM'.

'showing' acts as a link.

Can you help me to learn more?

(Another definition for epicurism that I've seen is " Love of fine food".)

I've seen this clue in The Daily Express.

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