Experiment involving Roman quartet seems frivolous (7)

I believe the answer is:

trivial

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'frivolous' is the definition.
(similar in meaning)

'experiment involving roman quartet' is the wordplay.
'experiment' becomes 'trial' (trial is a kind of experiment).
'involving' indicates putting letters inside.
'roman quartet' becomes 'iv' (Roman numerals for four. I am not sure about the 'roman' bit.).
'trial' going around 'iv' is 'TRIVIAL'.

'seems' is the link.

Can you help me to learn more?

(Other definitions for trivial that I've seen before include "Rinky-dink" , "Quite unimportant and paltry" , "Of little importance" , "Of little substance or significance" , "Of little consequence" .)

I've seen this clue in The Irish Times.

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