Crossword Genius

Upset delicate guts produced waves? (12)

Ross

I believe the answer is:

gesticulated

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'produced waves?' is the definition.
Although both the answer and definition are past participle verbs, I cannot understand how they can define each other.

'upset delicate guts' is the wordplay.
'upset' indicates anagramming the letters.
'delicate'+'guts'='delicateguts'
'delicateguts' with letters rearranged gives 'GESTICULATED'.

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I've seen this clue in The Telegraph.
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