Supremo jilted, conceals sign of how he's feeling (5)

I believe the answer is:

emoji

I'm a little stuck... Click here to teach me more about this clue!

'sign of how he's feeling' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'supremo jilted conceals' is the wordplay.
'conceals' says the answer is hidden in the clue.
'EMOJI' can be found hidden inside 'supremo jilted'.

Can you help me to learn more?

(Another definition for emoji that I've seen is " Graphic expression".)

I've seen this clue in The Irish Times.

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