Sing idea 'til composition has shown up (10)

I believe the answer is:

humiliated

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'shown up' is the definition.
Although both the answer and definition are past participle verbs, I can't see how they can define each other.

'sing idea 'til composition' is the wordplay.
'sing' becomes 'hum' (humming is a kind of singing).
'composition' indicates anagramming the letters (letters arranged or composed in a different order).
'idea'+'til'='ideatil'
'ideatil' anagrammed gives 'iliated'.
'hum'+'iliated'='HUMILIATED'

'has' acts as a link.

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I've seen this clue in The Daily Express.

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