Knock down deals for ocean travellers (9)

I believe the answer is:

deckhands

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'ocean travellers' is the definition.
The answer and definition can be both people as well as being plural nouns.
Maybe there's a link between them I don't understand?

'knock down deals' is the wordplay.
'knock down' becomes 'deck' (deck can mean to knock over).
'deals' becomes 'hands' ('hand' can be a synonym of 'deal').
'deck'+'hands'='DECKHANDS'

'for' is the link.

Can you help me to learn more?

(Another definition for deckhands that I've seen is " Crewmen".)

I've seen this clue in The Guardian.

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