Dromio or Antipholus potentially land in it twice by accident (9,4)

I believe the answer is:

identical twin

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'dromio or antipholus' is the definition.
I can't tell whether this defines the answer.

'land in it twice by accident' is the wordplay.
'by accident' is an anagram indicator.
'land'+'in'+'it'+'twice'='landinittwice'
'landinittwice' is an anagram of 'IDENTICAL TWIN'.

'potentially' acts as a link.

Can you help me to learn more?

(Other definitions for identical twin that I've seen before include "Lookalike sibling" , "One of two from the same fertilised egg" .)

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