Icon making supremo jittery to some extent (5)

I believe the answer is:

emoji

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'icon' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'making supremo jittery to some extent' is the wordplay.
'to some extent' says the answer is hidden in the clue.
'EMOJI' can be found hidden inside 'making supremo jittery'.

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 Times.

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