Crossword Genius

Overtake green wreck - vessel isn't a freighter (9,4)

Ross

I believe the answer is:

passenger ship

I'm a little stuck... Click here to teach me more about this clue!

'isn't a freighter' is the definition.
I can't tell whether this defines the answer.

'overtake green wreck vessel' is the wordplay.
'overtake' becomes 'pass' (as in passing on a road).
'wreck' indicates anagramming the letters.
'vessel' becomes 'ship' (ship is a kind of vessel).
'green' with letters rearranged gives 'enger'.
'pass'+'enger'+'ship'='PASSENGER SHIP'

Can you help me to learn more?

I've seen this clue in The Irish Independent.
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