She's the one left out twice! (3)

I believe the answer is:

lil

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'she's' is the definition.

'one left out twice' is the wordplay.
'one left' becomes 'L' (common abbreviation).
'out twice' becomes 'il' (I can't explain this - if you can you should give a lot more credence to this answer).
'l'+'il'='LIL'

'the' acts as a link.

Can you help me to learn more?

(Another definition for lil that I've seen is " 'Diamond - - ', 17's Broadway hit".)

I've seen this clue in the Evening Standard.

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