Surfer's need? (4)

I think it could be either:

Which length description are you looking for?:

wave

'surfer's need' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for wave that I've seen before include "Move hand to and fro as greeting" , "Hand gesture -- hair feature" , "Billow" , "Undulating curve" , "Greeting; undulation" .)

I've seen this clue in the Universal and The Star Tribune.

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