Crossword Genius

Administers oath to witness home after ship crosses river (6,2)

Ross

I believe the answer is:

swears in

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'administers oath to witness' is the definition.
I can't judge whether this definition defines the answer.

'home after ship crosses river' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'after' says to put letters next to each other.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'crosses' means one lot of letters goes inside another.
'river' becomes 'wear' (river in the north east of England).
'ss' enclosing 'wear' is 'swears'.
'in' put after 'swears' is 'SWEARS IN'.

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I've seen this clue in The Telegraph.
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