Crossword Genius

Northern swimmer Jack sent round extract from Moby-Dick? (6)

Ross

I believe the answer is:

baleen

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'extract from moby-dick?' is the definition.
I can't tell whether this defines the answer.

'northern swimmer jack sent round' is the wordplay.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'swimmer' becomes 'eel' (eel is a kind of fish).
'jack' becomes 'ab' (both can mean a sailor).
'sent round' shows that the letters should be reversed in order.
'n'+'eel'+'ab'='neelab'
'neelab' written backwards gives 'BALEEN'.

Can you help me to learn more?

(Another definition for baleen that I've seen is " Enable (anag) - whalebone".)

I've seen this clue in The Times.
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