Crossword Genius

Is it entered by shipping agent on order? (7)

Ross

I believe the answer is:

tonnage

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

'is it entered by shipping' is the definition.
I can't tell whether this defines the answer.

'agent on order?' is the wordplay.
'order?' indicates anagramming the letters (I've seen 'ordering' mean this).
'agent'+'on'='agenton'
'agenton' with letters rearranged gives 'TONNAGE'.

Can you help me to learn more?

(Other definitions for tonnage that I've seen before include "Weight of cargo - ship's carrying capacity" , "Measure of cargo space" , "Ship's size or carrying capacity" , "Capacity of ship" , "No agent (anag)" .)

I've seen this clue in The Globe and Mail.
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