Crossword Genius

Complain in notes about cargo-carrying capacities of ships (8)

Ross

I believe the answer is:

tonnages

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

'cargo-carrying capacities of ships' is the definition.
I can't tell whether this defines the answer.

'complain in notes about' is the wordplay.
'complain' becomes 'nag' (nagging is a kind of complaining).
'in' indicates putting letters inside.
'about' is an anagram indicator.
'notes' anagrammed gives 'tones'.
'nag' inserted into 'tones' is 'TONNAGES'.

Can you help me to learn more?

I've seen this clue in The Hindu.
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