Crossword Genius

Spare time to pass on boxes to send abroad (9)

Ross

I believe the answer is:

extradite

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'send abroad' is the definition.
I can't judge whether this defines the answer.

'spare time to pass on boxes' is the wordplay.
'spare' becomes 'extra' (synonyms).
'time' becomes 't' (abbreviation).
'to pass on' becomes 'die' (pass on can mean to die).
'boxes' indicates putting letters inside (the outside letters must 'box' inside letters in).
't' placed into 'die' is 'dite'.
'extra'+'dite'='EXTRADITE'

'to' is the link.

Can you help me to learn more?

(Other definitions for extradite that I've seen before include "Hand over (suspect) to a foreign country" , "Hand over abroad" , "Bring from abroad" , "Send home" , "Hand over to authorities of another country" .)

I've seen this clue in The Times.
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