Literally the last part of a frolicsome game (5)

I believe the answer is:

omega

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'literally the last part' is the definition.
I can't judge whether this defines the answer.

'of a frolicsome game' is the wordplay.
'of' indicates a hidden word.
'OMEGA' is hidden within 'frolicsome game'.

Can you help me to learn more?

(Other definitions for omega that I've seen before include "Ultimate letter" , "Ending of a series or sequence" , "Conclusion" , "The last in a series of letters" , "24th Greek letter" .)

I've seen this clue in The Irish Independent.

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