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Tears out inside of withdrawn passport, say, and makes mess below (11)

Ross

I believe the answer is:

disembowels

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'tears out inside' is the definition.
Although both the answer and definition are verbs in their -s form, I don't see how one could define the other.

'withdrawn passport say and makes mess below' is the wordplay.
'withdrawn' shows that the letters should be reversed in order.
'passport say' becomes 'ID' (a passport is identification).
'and' is a charade indicator (letters next to each other).
'makes' indicates an anagram.
'id' back-to-front is 'di'.
'mess'+'below'='messbelow'
'messbelow' is an anagram of 'sembowels'.
'di'+'sembowels'='DISEMBOWELS'

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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